Anatomy 2 - Triangles of the Neck
Terms
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- what landmarks delineate the SUPERIOR boundary of the neck
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Mandible
Mastoid process
External occipital protuberance
Superior nuchal line - what landmarks delineate the INFERIOR boundary of the neck
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Manubrium - jugular notch
Acromion process of scapula
Clavicle - Which bones and cartilages make up the ANTERIOR aspect of the neck (at its midline), from SUPERIOR to INFERIOR
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(superior to inferior)
Hyoid bone
Thyroid cartilage with thyroid notch (Adam's apple) - thyroid lamina
Cricoid cartilage
Tracheal cartilages - what 2 structures is the Thyroid Gland located in between
- Cricoid cartilage and Trachea
- how many origins does the sternocleidomastoid have
- 2 heads
- what are the origins of the Sternocleidomastoid muscle
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manubrium of the sternum
and
the medial 1/3 of the clavicle - what are the insertion points of the sternocleidomastoid muscle
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mastoid process of the temporal bone
and
superior nuchal line - which muscle divides the neck into anterior and posterior triangles
- sternocleidomastoid
- what are the posterior triangle's boundaries (or what things outline the posterior triangle)
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sternocleidomastoid
trapezius
middle third of the clavicle - what triangles does the posterior triangle further subdivide into
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occipital triangle
supraclavicular (subclavian) triangle - what muscle creates the 2 subdivisions of the posterior triangls
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inferior head of the omohyoid muscle
(creates the occipital and subclavian triangles) - what is the deepest portion of the posterior triangle called
- the floor is the deepest portion
- which prevertebral muscles and prevertebral fascia make up the floor of the posterior triangle
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Splenius capitis
Levator scapulae
Scalene muscles (anterior, middle and posterior scalene muslces) - what do you call the most superficial portion of the posterior triangle
- the roof is the most superficial portion
- what makes up the roof of the posterior triangle
- investing fascia
- what is investing fascia
- superficial layer of deep cervical fascia
- list the structures that are found in the posterior triangle
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Accessory nerve XI (11)
Brachial plexus
Cervical plexus
Subclavian artery and branches
Subclavian vein and tributaries - what is the only real structure that passes through the posterior triangle and what does it pass through
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Accessory Nerve XI
passes through investing and prevertebral fascias - what forms the Brachial plexus
- ventral primary rami of spinal nerves C5, C6, C7, C8, and T1
- what kind of branches are cervical plexus made of
- cutaneous branches
- what are the boundaries (outlines) of the anterior triangle
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midline
sternocleiodomastoid
mandible - what are the anterior trangles subdivided into
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Submandibular (digastric) triangle
Submental triangle
Muscular triangle
Carotid triangle - which triangles of the anterior triangle are bilateral
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submandibular triangle
muscular triangle
carotid triangle
(all except for submental triangle) - what are the boundaries of the submandibular (digastric) triangel
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anterior and posterior bellies of digastric muscle
mandible - what is the floor of the digastric triangle
- the mylohyoid muscle
- what are the contents of the submandibular (digastric) triangle
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Submandibular gland
Submandibular lymph nodes
Submandibular ganglion and Lingual nerve
Hypoglossal nerve (XII)
Mylohyoid nerve
Facial artery and vein - what are the submental triangle boundaries
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anterior bellies of both digastric muscles
hyoid muscle - what is the floor of the submental triangle made of
- mylohyoid muscle
- what is found in the submental
- submental lymph nodes
- what is the muscular triangle bounded by
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median plane of neck
superior belly of omohyoid muscle
sternocleidomastoid muscle - what can be found inside the muscular triangle (7 things)
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Trachea
Thyroid and parathyroid glands
Thyroid and cricoid cartilages
Recurrent laryngeal nerves
Infrahyoid muscles
Pharynx and esophagus
Carotid sheath and contents - what are the 2 major cartilages of the larynx
- thyroid and cricoid cartilages
- what are the boundaries of the carotid triangle
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posterior belly of digastric muscle
sternocleidomastoid muscle
superior belly of omohyoid muscle - what are the contents of the carotid triangle
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Hypoglossal nerve and superior root of ansa cervicalis
External carotid artery and 5 of its branches
Cervical sympathetic chain (Superior Cervical Ganglion)
Carotid sheath and contents - what are the contents of the carotid sheath in the carotid triangle
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-common carotid artery and internal carotid artery
-internal jugular vein
-vagus nerve - what are the 3 layers of tissue found in the neck (superficial to deep)
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1. Skin
2. Subcutaneous (superficial, hypodermis) fascia
3. Investing fascia (the superficial layer of the deep cervical fascia) - which muscle does the subcutaneous fascia house and what is this muscle used for
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the Platysma
one of the muscles of facial expression - what type of muscle is the PLATYSMA and which nerve innervates it
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1. very thin SKELETAL MUSCLE
2. innervated by the CERVICAL branch of the FACIAL NERVE (VII) - what muscles does the investing fascia envelope
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-envelopes the entire neck deep to subcutaneous fascia
-sternocleidomastoid muscles ANTERIORLY
-trapezius muscle POSTERIORLY - what is the skin of the NECK innervated by and what type of innervation is this
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-innervated by: sensory branches of the cervical plexus (ventral primary rami of spinal nerves C2 to C4)
-this is a CUTANEOUS innervation - what are the sensory branches of the cervical plexus
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Lesser occipital nerve (C2)
Great auricular nerve (C2, C3)
Transverse Cervical nerve (C2, C3)
Supraclavicular nerve (C3, C4) - what are the 2 prominent superficial veins found in the neck
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1. External Jugular
2. Anterior Jugular - how can you find the external jugular vein
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by locating the great auricular nerve
**it is ALWAYS found in relation to the great auricular vein - outline the path of the external jugular vein
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1. formed in region of the parotid gland
2. crosses the sternocleidomastoid
3. ends in the posterior triangle by piercing investing fascia - trace the path of the anterior jugular vein
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1. beings in the submental triangle
2. travels inferiorly in the anterior triangle - Which muscle divides the antero-lateral neck into two triangles?
- The STERNOCLEIDOMASTOID muscle divides the antero-lateral neck into two triangles
- What four other named triangles is the sternocleidomastoid muscle a boundary for?
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-the muscular triangle,
-the carotid triangle,
-the occipital triangle and
-the supraclavicular (subclavian) triangle - The middle third of the clavicle forms the boundary of which triangle?
- The posterior triangle and subclavian triangle
- What two triangles have the superior belly of the omohyoid as a boundary?
- The muscular triangle and the carotid triangle
- Which u-shaped bone forms a boundary of the submental triangle?
- The hyoid bone
- Which is the only non-bilateral triangle?
- The submental triangle
- What are the boundaries and floor of the submandibular triangle?
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The boundries of the submandibular(digastric) triangle are the anterior and posterior bellies of digastric muscle and the body of the mandible.
The floor of the submandibular (digastric) triangle is the mylohyoid muscle. - The prevertebral muscles and their encasing prevertebral fascia form the floor of which triangle?
- The posterior triangle
- The spinal accessory nerve is found obliquely traversing which triangle? Be Specific.
- The occipital triangle, a subdivision of the posterior triangle.
- The bifurcation of the common carotid artery occurs in what triangle?
- The carotid triangle
- The viscera of the neck are found in what triangle? What are its boundaries?
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The viscera of the neck are found in the muscular triangle.
The boundries of the muscular triangle are:
-Median plane of neck
-Superior belly of omohyoid muscle
-Sternocleidomastoid muscle - What deep cervical fascia encases the entire neck deep to the subcutaneous (superficial) fascia? What muscles are also encased by this deep fascial layer?
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The investing layer of (deep) cervical fascia.
The muscle encased by it are the sternocleidomastoid (anteriorily) and trapezius (posteriorily). - Which cranial nerves can one access through the carotid triangle?
- The vagus nerve(X) and the hypoglossal nerve (XII)
- The brachial plexus and the subclavian artery and vein can be accessed through which triangle?
- The subclavian triangle, a subdivision of the posterior triangle
- What muscle is located in the subcutaneous fascia of the neck and what nerve innervates it? To what group of muscles does this muscle belong to?
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The platysma muscle is the only muscle found in the subcutaneous fascia.
It is innervated by the cervical branch of the facial nerve (VII). The platysma belongs to the muscles of facial expression. - The cutaneous nerves of the neck and associated areas arise from what nerve plexus? What spinal nerves contribute fibers to this plexus from their ventral primary rami? List each of these cutaneous nerves and the cervical spinal nerve(s), which contribut
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The cutaneous nerves of the neck arise from the cervical plexus.
Spinal nerves C2-C4 contribute to this plexus.
The cutaneous nerves are as follows:
-Lesser occipital nerve (C2)
-Great auricular nerve (C2, C3)
-Transverse Cervical nerve (C2, C3)
-Supraclavicular nerve (C3, C4) -
Which of the following triangles is formed by the superior belly of the omohyoid, the anterior border of the sternocleidomastoid muscle, and the posterior belly of the digastric muscle?
a. supraclavicular
b. submandibular
c. digas - E
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The mylohyoid muscle forms the floor of the
a. muscular triangle
b. submental triangle
c. subclavian (supraclavicular) triangle
d. occipital triangle - B
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The sternocleidomastoid muscle forms a boundary for all of the following triangles of the neck EXCEPT:
a. occipital
b. subclavian (supraclavicular)
c. submandibular
d. posterior - C
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The carotid sinus is located in which of the following cervical triangles?
a. muscular
b. carotid
c. submandibular
d. occipital - B
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Which of the following structures is observed passing through the occipital triangle?
a. subclavian vein
b. brachial plexus
c. spinal accessory nerve
d. cervical branch of facial nerve
e. external jugular vein - C
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All of the following are located in the carotid triangle EXCEPT:
a. carotid body
b. lingual artery
c. vagus nerve
d. ascending pharyngeal artery
e. submandibular gland - E
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The trapezius takes origin from all of the following EXCEPT:
a. clavicle and spine of scapula
b. vertebral spines C7 to T12
c. superior occipital protuberance
d. ligamentum nuchae - A
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The mylohyoid muscle forms the floor of the
a. posterior triangle
b. submandibular triangle
c. muscular triangle
d. subclavian triangle - B
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The anterior bellies of the two digastric muscles form the boundaries of the
a. carotid triangle
b. submandibular triangle
c. anterior triangle
d. submental triangle - D
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The external jugular veins
a. lie in the carotid sheath lateral to the common carotid artery
b. are formed by the union of the retromandibular and posterior auricular veins
c. are connected by the jugular arch
d. receive blo - B
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The skin of the occipital region and the auricle receive sensory innervation from the
a. lesser occipital nerve
b. great auricular nerve
c. transverse cervical nerve
d. a and b
e. a and c - D