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Posterior and Anterior Triangle of the Neck
Medical School Gross Anatomy
51
Anatomy
Graduate
09/18/2011

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Term
What is the foramen transversarium?
Definition
small area on cervical vertebrae in which the vertebral artery passes through
Term
What does the C1 vertebrae lack?
Definition
A spinous process
Term
What is unique about cervical vertebrae (excluding C1) spinous and transverse processes?
Definition
They are bifid
Term
What is the Vertebra Prominens?
Definition
This is the proper name of the seventh cervical vertebrae
Term
What is the enervation of the platysma?
Definition
CN VII, the facial nerve
Term
What does the investing fascia surround?
Definition
Surrounds all structures of the neck. This fascia splits to surround some of the structures: Trapezius, Sternocleidomastoid, Infra and Suprahyoid muscles, and the submandibular and parotid salivary glands
Term
What does the prevertebral fascia surround?
Definition
The vertebral column and muscles. This is the fascia that makes up the axillary sheath
Term
What is surrounded by the pretracheal/visceral layer of fascia?
Definition
Surrounds the viscera of the neck: trachea, esophagus, thyroid, and parathyroid glands
Term
The Carotid Sheath is composed of which fascia?
Definition
All the layers: the investing layer, the prevertebral layer, and the pretracheal/visceral layer
Term
What is the enervation of the Trapezius?
Definition
Motor: Cranial nerve 11 (Spinal/Accessory nerve)

Sensory: C2 (proprioception)
Term
What is the function of the trapezius?
Definition
elevate and rotate the scapula

clinical test: shoulder shrug
Term
What is the enervation of the Sternocleidomastoid?
Definition
Motor: Cranial Nerve XI (Spinal/Accessory)

Sensory: C2 (proprioception)
Term
What is the function of the sternocleidomastoid?
Definition
Flexion of the neck, as well as neck rotation
Term
What is torticollis?
Definition
stiff neck associated with neck spasms of the sternocleidomastoid
Term
What are the boundaries of the posterior triangle?
Definition
Trapezius and Sternocleidomastoid,
Term
What veins should be found in the posterior triangle?
Definition
External Jugular and Subclavian vein
Term
What nerves should be found in the posterior triangle?
Definition
Lesser occipital, Great auricular, Supraclavicular, and Transverse cervical
Term
What are the branches of the thyrocervical trunk?
Definition
Transverse cervival, inferior thyroid, and suprascapular
Term
What structures pass between the anterior and middle scalene muscles?
Definition
Brachial plexus and subclavian artery
Term
What structures pass anteriorly to the anterior scalene muscles?
Definition
subclavian vein and phrenic nerve
Term
[image]
Identify the structures
Definition
A: Lesser Occipital
B: Great Auricular
C: Transverse Cervical
D: Supraclavicular
E: Superior Root of Ansa Cervicalis
F: Inferior Root of Ansa Cervicalis
G: Phrenic Nerve
Term
What important structures of the neck is found at the level of C3?
Definition
Hyoid bone
Term
What important structures of the neck do we find at the Level of C4-C5
Definition
Thyroid Cartiledge as well as the bifurcation of the common carotid (C4)
Term
What important structures of the neck do we find at level C6?
Definition
Cricoid cartiledge, middle cervical sympathetic ganglion, also demarcates the change of pharynx to esophagus and larynx to trachea
Term
What are the sub-triangles of the anterior triangle?
Definition
Submandibular (Digastric) Triangle
Submental Triangle
Muscular Triangle
Carotid Triangle
Term
What muscles are found in the muscular triangle?
Definition
The Infrahyoid or Strap Muscles
Term
[image]
Identify the muscles
Definition
1: Omohyoid
2: Sternohyoid
3: Sternothyroid
4: Thyrohyoid
Term
What is the function of the infrahyoid (strap) muscles?
Definition
Depress the hyoid bone
Term
What is the enervation of the infrahyoid (Strap) muscles?
Definition
All of the infrahyoid muscles are enervated by the ansa cervicales except for the thyrohyoid muscle which is enervated by the nerve to the thyrohyoid (C1)
Term
What viscera are found in the muscular triangle?
Definition
Thyroid and Parathyroid glands
Term
What provides vascularization to the Thyroid gland? And from what arteries do they branch?
Definition
The superior and inferior thyroid arteries.

Superior Thyroid artery is a branch of the external carotid

Inferior Thyroid is a branch of the Thyrocervical trunk
Term
What are the contents of the submental triangle?
Definition
Submental lymph nodes
anterior floor of mouth and tip of tongue
Term
What are the muscles of the submandibular (digastric) triangle?
Definition
Suprahyoid muscles:

Digastric muscle
Mylohyoid muscle
Geniohyoid muscle
Stylohyoid muscle
Term
What is the function of the suprahyoid muscles?
Definition
Elevate the hyoid bone
Term
What is the enervation of the Geniohyoid muscle?
Definition
Nerve to the geniohyoid. A branch of C1 that travels with the hypoglossal nerve
Term
What is the enervation of the Digastric muscle?
Definition
Depends on the belly.

The anterior belly is enervated by the nerve to the mylohyoid (mandibular nerve, trigeminal)

The posterior belly is enervated by CN VII, the facial nerve
Term
What is the enervation of the stylohyoid?
Definition
CN VII, Facial Nerve
Term
What is the enervation of the mylohyoid muscle?
Definition
Nerve to the mylohyoid muscle. Which is derived from the Trigeminal Nerve (Mandibular branch, inferior alveolar branch)
Term
What are the contents of the carotid sheath?
Definition
Internal jugular, common carotid (which then splits into internal and external), vagus nerve, and deep cervical lymph nodes
Term
What are the contents of the carotid triangle?
Definition
Carotid sheath, hypoglossal nerve
Term
[image]
Identify the structures
Definition
C: Common Carotid
E: External Carotid
I: Internal Carotid

1: Superior Thyroid
2: Ascending Pharyngeal
3: Lingual
4: Occipital
5: Facial
6: Posterior Auricular
7: Maxillary
8: Superficial Temporal
Term
What is the function of the Carotid Body?
Definition
Senses changes in PO2 and PCO2, as well as Temp and Ph

Bean shaped structure outside of carotid artery
Term
What is the function of the Carotid Sinus?
Definition
Monitors blood pressure. Located in the bifurcation of the common carotid
Term
What is the enervation of the Intrinsic muscles of the Larynx?
Definition
The recurrent laryngeal nerve. Except for the Cricothyroid which is enervated by the external laryngeal nerve
Term
What provides vascularization to the intrinsic laryngeal muscles? From what arteries does it originate?
Definition
Superior and Inferior laryngeal arteries. The superior laryngeal is a branch from the superior thyroid and the inferior laryngeal is a branch from the inferior thyroid
Term
What is the Ansa Subclavian?
Definition
Branches off of the sympathetic trunk that loop around the subclavian
Term
In what ganglia do the parasympathetics from CN 3 synapse?
Definition
Ciliary
Term
In what ganglia do the parasympathetics of CN 7 synapse?
Definition
in either:
Pterygopalatine
or
Submandibular
Term
In what ganglia do the parasympathetics of CN 9 synapse?
Definition
Otic
Term
Where do all the Lymphnodes of the head drain?
Definition
Into the Jugular trunk
Term
[image]
Identify the lymphnodes
Definition
1. Parotid
2. Mastoid
3. Buccal
4. Submental
5. Submandibular
6. Deep Cervical
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