Anatomy of the Neck Flashcards
In what layer of fascia does the platysma muscle reside?
superficial fascia
What is the main function of the platysma muscle?
wrinkles the skin of the neck
Which muscles are enclosed in the deep investing fascia of the neck?
the sternocleidomastoid and the trapezius
What is the innervation of the platsyma?
facial nerve (CN VII)
What is the innervation of the trapezius and sternocleidomastoid?
spinal accessory nerve (CN XI)
Which muscles are associated with the prevertebral fascia?
Scalene muscles, lavator scapulae, longus capitis and longus coli
What are the main function of the scalene muscles?
to elevate the 1st and 2nd rib; lateral flexion of the neck
What is the innervation of the scalene muscles?
C4-C8 ventral rami
Between which two scalene muscles do the cervical (C1-C4) and brachial (C5-T1) plexi exit the neck?
anterior and middle scalene muscles
Which muscles are associated with the pretracheal fascia?
the infrahyoid muscles: sternohyoid, sternothyroid, omohyoid, and thyrohyoid
What are the functions of the infrahyoid muscles?
depressing and supporting the hyoid bone
What is the innervation of the infrahyoid muscles?
C1-C3, through the ansa circularis
What is the primary function of the carotid sinus?
baroreceptor; sensing low pressure increases sympathetic tone, decreases PS tone
What is the primary function of the carotid body?
chemoreceptor?
Where is the carotid body located?
between the internal and external carotid arteries
