neck

Question 0

what is the origin of the SCM?

Answer 0

the lateral surface of mastoid process of the temporal bone and lateral half of superior nuchal line

Question 1

what are the roots of the brachial plexus?

Answer 1

anterior rami of c5-c8 and T1

Question 2

what are the points of insertion for the SCM?

Answer 2

sternal head: anterior surface of manubrium of sternum

clavicular head: superior surface of medial third of clavicle

Question 3

what innervates the SCM?

Answer 3

spinal accessory nerve (11) C2 and C3 nerves

Question 4

what are the main actions of the SCM?

Answer 4

unilateral contraction: tilts head to same side and rotates it so face is turned superiorly toward opposite side

bilateral contraction: extrends neck at atlanto-occipital joints. flexes cervical vertebrae so that chin approaches manibrum. extends superior cervicle vertebrae so chin is thrust forward with head kept level. with cervicle vertebrae fixed, may elevate manubrium and medial end of clavicles, assisting pump-handle action of deep respiration

Question 5

what are the segments of the lesser occipital nerves?

Answer 5

C2

Question 6

WHAT does the lesser occipital nerve innervate?

Answer 6

the lesser occipital nerve supplies the skin of the neck and scalp posterosuperior to the auricle

Question 7

what are the segments of the greater auricular nerve?

Answer 7

C2 and C3

Question 8

WHAT does the greater auricular nerve innervate?

Answer 8

the greater auricular nerve ascends vertically across the SCM onto the parotid gland, where it divides and supplies the skin and sheath over the gland, the posterior aspect of the auricle, and the skin overlying the angle of the mandible to the mastoid process

Question 9

what are the segments of the transverse cervicle nerve?

Answer 9

c2 and c3

Question 10

what does the transverse cervical nerve innervate?

Answer 10

the transverse cervucle nerve supplies the skin covering the anterior cervical region; the nerve curves around the middle of the posterior border of the SCM and passes anteriorly and horizontally across it, deep to the EJV and platysma

Question 11

what are the segments of the supraclavicular nerves?

Answer 11

C3 and C4

Question 12

What do the supraclavicular nerves innervate?

Answer 12

they emerge from as a common trunk undercover of the SCM and send small branches to the skin of the neck and cross the clavicle to supply the skin over the shoulder.

Question 13

phrenic nerve segment

Answer 13

c3 c4 and c5

Question 14

what does the phrenic nerve innervate?

Answer 14

sole motor supply to the diaphram. in the thorax the nerves supply the mediastinal pleural and the pericardium

c3 c4 c5 keeps the phrenic nerve alive

Question 15

where does the external jugular vein begin?

Answer 15

near the angle of the mandible by the union of the posterior division of the retromandibular vein with the posterior auricular vein

Question 16

what are the segments of the dorsal scapular nerve

Answer 16

c4 c5

Question 17

what does the dorsal scapular nerve innervate?

Answer 17

rhomboids