Chapter 16: Spinal Cord and Spinal Nerves

each set of rami communicants extends between the spinal nerve and the ball like structure called the .....

sympathetic trunk ganglion

there are five roots of anterior rami that unite to form the superior, middle, and inferior ...... in the posterior triangle of the neck

trunks

lateral horns are found in the .... parts of the spinal cord only

T1-L2

the major region of the spinal cord where the anterior rami of spinal nerves do NOT for the plexus is the ...

T2-T12

the medial cord is medial to the axillary artery and is formed by the .... division of the inferior trunk. It contains potions of nerves ....

anterior / C8-T1

the deep fibular nerve supplies the .... leg muscles and the muscles on the .... of the foot

anterior / dorsum

after splitting from the spinal nerve, the anterior ramus divides into multiple other branches, which innervate the .... portions of the trunk, the upper limbs, and the lower limbs

anterior / lateral

the lumbar plexus is subdivided into an .... division and a .... division

anterior / posterior

anterior rami of nerves T3-T6 follow the costal grooves of the ribs to innervate the intercostal muscles and receive sensations from the .... chest wall

anterior and lateral

a nerve plexus is a network of interweaving ..... of spinal nerves

anterior rami

a typical spinal nerve has four main branches after it emerges from the spinal columns: the ...., ...., and two .....

anterior ramus / posterior ramus / rami communications

spinal nerve T12 is called a subcostal nerve because it arises .... the ribs

below

a portion of the anterior ramus of T1 helps form the .... plexus, but a branch of it travels within the first intercostal space

brachial

the components of the ... plexus extend laterally from the neck, pass superior to the first rib, and then continue into the axilla

brachial

the gray matter in the spinal cord is .... located, and its shape resembles a letter H or a ....

centrally / butterfly

portions of the superior, middle, and inferior trunks divide deep to the .... into an anterior division and a posterior division, which primarily contain axons that innervate the anterior and posterior parts of the ......

clavicle / upper limb

some individual fasciculi conduct motor impulses as ... from the brain to the spinal cord

descending tracts

the nerves emerging from a sacral plexus innervate the .... region, pelvis, perimeum, posterior thigh, and almost all of the ....

gluteus / leg and foot

the tibial division of the sciatic nerve innervates the ... and the hamstring part of the ....

hamstrings / adductor magnus

nerve C7 becomes the .... trunk of the anterior rami and nerves C8 and T1 unite to form the .... trunk

middle / inferior

Each lateral funiculus contains both ___ and ___ tracts.

motor / sensory ascending / descending

a spinal nerve contains .... axons

motor and sensory

each side of the spinal cord contains ... cervical nerves, .... thoracic, .... lumbar nerves, .... sacral nerves, .... and 1 coccygeal

8 / 12 / 5 / 5

the left and right cervical plexuses are located deep on each side of the neck, immediately lateral to cervical vertebrae ....

C1-C4

Each brachial plexus is formed by the anterior rami of spinal nerves

C5-TI

in the brachial plexus the posterior cord contains portions of ... nerves

C5-TI

if a person experiences numbness along the medial side of the arm and forearm, what spinal nerve would be damaged?

C8

most of the thoracic spinal nerves as well as nerves ....., do not form plexuses

S5-Co1

the anterior rami (sometimes called roots) of the brachial plexus are simply the continuations of the .... rami of the spinal nerves .....

anterior / C5-T1

the ... rami of most spinal nerves from nerve plexuses on the right or left side of the body

anterior

the superficial fibular nerve innervates the lateral compartment muscles of the leg, specifically those that .... and the weak plantar flexors

evert the foot

The white matter of the spinal cord is .... to the gray matter

external

the ... cervical spinal nerve is not considered part of the cervical plexus

fifth

the anterior and posterior roots of the thoracic spinal nerves merge to form a spinal nerve within an intervertebral foramen that is ..... to the vertebra of the same number

inferior

the ulnar nerve arises from the ... cord of the brachial plexus and descends along the medial side of the arm

medial

the white matter region on each lateral side of the spinal cord is the

lateral funiculus

the radial nerves arises from the .... cord of the brachial plexus

posterior

a phenomenon in which pain or discomfort from one organ is mistakenly referred to a dermatome is called ....

referred visceral pain

the posterior aspect of each segment of the spinal cord contains multiple posterior ... that enter the posterior aspect of the spinal cord

rootlets

the tibial nerve conducts .... impulses from the skin covering the sole of the foot.

sensory

the spinal cord and its attached spinal nerves serve an important function. they are a pathway for .... impulses

sensory and motor

each terminal branch of a plexus contains axons from ... spinal nerves

several different

a dermatome is a specific segment of ... supplied by a single spinal nerve

skin

the sciatic nerve is actually composed of two divisions wrapped in a common sheath . What are the two divisions?

tibial and common fibular

the axons within each white matter funiculus are originated into smaller structural units called ....

tracts