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50 Cards in this Set

  • Front
  • Back
What muscle divides the anterior and posterior triangles when looking at the neck from the side?
sternomastoid m
What is the base of the posterior cervical triangle?
clavicle
What is the posterior boundary of the posterior cervical triangle
trapezius
What is the anterior boundary of the posterior cervical triangle?
sternomastoid
What is the roof of the posterior cervical triangle?
skin

superficial fascia

investing fascia
What muscles is contained within the superficial fascia?
platysma
What nerve is embedded within the investing fascia?
accessory nerve (CN XI)
What comprises the floor of the posterior cervical triangle?
5 muscles

splenius capitis, levator scapulae, posterior scalene, middle scalene, anterior scalene
What are the 5 muscles that comprise the floor of the posterior cervical triangle?
splenius capitis

levator scapulae

posterior scalene

middle scalene

anterior scalene
Origin of sternomastoid
manubrium & medial 1/3 of the clavicle
What is the manubrium?
upper part of sternum
What is the insertion of the sternomastoid
mastoid process

lateral 1/2 of the superior nuchal line of skull
What is the action when one sternomastoid m contracts?
rotates and draws the head to the shoulder
What is the action when both sternomastoid mm contracts?
flex the cervical column
Innervation of the sternomastoid
spinal accessory nerve (CN XI)
What are the two roots of the spinal accessory nerve?
cranial & spinal
What does the cranial root of CN XI contribute?
accessory to the vagus nerve (CN X) because it provides part of the motor component
Where does the fibers from the spinal root come from?
ventral primary ramus of C2

ventral rami of C3 & C4
Where do the fibers from ventral primary ramus of C2 supply?
sternomastoid
Where do the fibers from ventral rami of C3 & C4 supply?
trapezius
What two subdivisions within the posterior cervical triangle are defined by the omohyoid muscle?
occipital triangle

supraclavicular triangle
Where is the position of the occipital triangle compared to the omohyoid muscle?
superior
Where is the position of the supraclavicular triangle compared to the omohyoid muscle?
inferior
Origin of omohyoid m
medial lip of suprascapular notch
Insertion of omohyoid m
lower border of the body of the hyoid
Actions of omohyoid
steadies the hyoid

depresses & retracts the hyoid & larynx
Innervation of omohyoid
ansa cervicalis (C2 & C3)
Where does the external jugular vein lie compared with sternomastoid
superficial
What is the external jugular vein a tributary of?
subclavian v
What v are tributaries of the external jugular v
retromandibular

posterior auricular

transverse cervical

suprascapular

anterior jugular v
Where does the axillary v become the subclavian v?
lateral border of 1st rib
What v is formed by the union of the subclavian & internal jugular v
brachiocephalic
What is the right subclavian artery a branch of?
brachiocephalic trunk
What is the left subclavian artery a direct branch of?
aortic arch
Both subclavian arteries pass posterior to what m
anterior scalene
How many parts of the subclavian a is there?
3
Where does the first part of the subclavian artery lie?
medial to anterior scalene
What are the branches of the 1st subclavian part?
vertebral and internal thoracic arteries

thyrocervical and costocervical trunks
Where does the 2nd subclavian part lie?
passes posterior to anterior scalene
Where is the 3rd subclavian part positioned?
upper surface of the first rib, producing a groove on this bone
What branch of the external carotid artery runs deep to sternomastoid?
occipital artery
Where does the occipital artery pass?
crosses the upper portion of the posterior cervical triangle on way to scalp in occipital region
Where does the brachial plexus emerge?
between anterior and middle scalene muscles
What cutaneous branch of the cervical plexus ascends to the scalp posterior to the external ear>?
lesser occipital nerve (C2 & C3)
What cutaneous branch of the cervical plexus passes anterior to the sternomastoid to supply the external ear?
great auricular nerve (C2 & C3)
Besides innervating the auricle of the ear, what other branches does the great auricular nerve give?
skin of mastoid, parotid, masseteric regions
What cutaneous branch of the cervical plexus travels anteriorly to innervate the skin of the anterior cervical triangle?
transverse cervical nerve (C2 & C3)
What cutaneous branches of the cervical plexus desend in the neck to cross the clavicle and be distributed to the skin of the supraclavicular triangle, pectoral, deltoid & acromial regions?
supraclavicular nerves (C3 & C4)

***3 branches
Several lymph nodes within the posterior cervical triangle drain what?
occipital scalp and back of neck
Where does the lymph eventually drain to?
jugular lymph trunk