Neck Flashcards
2 fascias of neck
superficial and deep cervical fascia
location of superficial fascia
between skin and deep cervical fascia
contents of superficial fascia
superficial veins (including external jugulars), lymph nodes, adipose tissue, platysma muscle
layers of deep cervical fascia
investing layer, prevertebral layer, pretracheal layer, carotid sheaths
investing layer
surrounds all structures in the neck
contents of prevertebral layer
vertebral column, deep muscles of neck
contents of pretracheal layer
viscera of neck (pharynx, esophagus, thyroid gland, trachea)
posterior part of pretracheal layer aka
buccopharyngeal fascia
contents carotid sheaths
neurovascular bundles (common carotid artery, internal jugular vein, vagus nerve)
location of pretracheal space
between investing layer and pretracheal layer
location of retropharyngeal space
between buccopharyngeal layer and prevertebral layer
location of third space
within anterior prevertebral fascia covering vertebral bodies
boundaries of anterior triangle
anterior border of sternocleidomastoid, inferior mandible, midline of neck
boundaries of posterior triangle
posterior border of sternocleidomastoid, anterior border of trapezius, clavicle
function of suprahyoid muscles
raise the hyoid bone toward mandible during swallowing
innervation of suprahyoid muscles
facial or trigeminal nerve
function of infrahyoid muscles
depress hyoid bone and larynx during swallowing and vocalization
innervation of infrahyoid muscles
ansa cervicalis
location of scalene muscles
in posterior triangle
function of scalene muscles
accessory muscles of respiration, neck flexion
innervation of scalene muscles
branches of cervical spinal nerves
what passes between anterior and middle scalene muscles
brachial plexus and subclavian artery
location of thyroid gland
visceral compartment of neck inferior to thyroid cartilage, isthmus crosses anterior surfaces of second and third tracheal cartilages
components of thyroid gland
two lobes and an isthmus
thyroid gland is surrounded by
pretracheal fascia
blood supply to thyroid gland
superior thyroid artery, inferior thyroid artery
venous drainage from thyroid gland
internal jugular or brachiocephalic
first branch of external carotid artery
superior thyroid artery
inferior thyroid artery location
branch of thyrocervical trunk off the subclavian artery
thyroid gland is closely associated with
recurrent laryngeal nerves
course of recurrent laryngeal nerves near thyroid gland
pass deep to the lateral lobes of thyroid and enter larynx
parathyroid glands location
deep surface of lateral lobes of thyroid gland
parathyroid glands function
produce parathyroid hormone to regulate calcium levels
where does the common carotid artery split
the level of the thyroid cartilage
course of internal carotid artery
does not give off any branches and enters skull to supply brain
branches of external carotid
superior thyroid, ascending pharyngeal, lingual, facial, occipital, posterior auricular, maxillary
terminal branch of external carotid
superficial temporal
cervical plexus is formed from
anterior rami of C1-C4 spinal nerves
location of cervical plexus
posterior triangle
function of cervical plexus
supplies motor and sensory innervation to structures in neck and trunk
two important motor branches of cervical plexus
phrenic nerve, ansa cervicalis
phrenic nerve origin
C3-C5
ansa cervicalis origin
C1-C3
ansa cervicalis function
motor innervation to infrahyoid muscles
sensory innervation of cervical plexus
skin of neck, upper thorax, scalp, ear
where do sensory nerves of cervical plexus enter the skin
posterior border of sternocleidomastoid muscle (Erb’s point)
site of cervical nerve block
Erb’s point
major sensory branches of cervical plexus
lesser occipital, greater auricular, transverse cervical, supraclavicular