Exam 3: Thoracic Nerves

Question 1

___ pairs of thoracic spinal nerves

Answer 1

12

Question 2

Each mixed nerve divides into

Answer 2

Posterior and anterior primary ramus

Question 3

Posterior primary ramus projects posteriorward and divides into

Answer 3

Medial and lateral branch

Question 4

Medial and lateral branches of posterior primary rami are

Answer 4

Mixed

Question 5

Medial branches have ____ function

Answer 5

Motor and sensory

Question 6

Muscles supplies by medial branch of posterior primary rami

Answer 6

Semispinalis (upper 6)
Longissimus (lower 6)
Multifidi (all)

Question 7

Medial branches of posterior primary rami sensory supply

Answer 7

Skin paraspinally

Question 8

Lateral branches _____ from superior to inferior

Answer 8

Increase in size

Question 9

Muscles supplied by lateral branches of posterior primary rami

Answer 9

Longissimus
Iliocostalis
Levator costarum

Question 10

Lateral branches of posterior primary rami sensory supply

Answer 10

Skin near costal angles

Question 11

Anterior primary generally follow course of

Answer 11

Rib above the nerve

Question 12

Anterior primary of T2 (sometimes T1) contribute to

Answer 12

Intercostobrachail N

Question 13

Anterior primary ramus of T1 will contribute to

Answer 13

Brachial plexus

Question 14

A smaller branch of T1 will form

Answer 14

1st intercostal N

Question 15

Each intercostal N gives off a

Answer 15

Lateral cutaneous branch

Question 16

Lateral cutaneous brancches divide into

Answer 16

Anterior and posterior branches

Question 17

Lateral cutaneous branches sensory supply

Answer 17

Overlying skin

Question 18

Intercostal nerves terminate as ___ which supply

Answer 18

Anterior cutaneous branches

Skin close to midline

Question 19

Muscles supplied by intercostal N

Answer 19

Internal/external intercostals
Innermost intercostals
Serratus poterior
Transversus thoracis
Transverse abdominal
Internal/external oblique
Rectus abdominis

Question 20

Intercostal N also supply adjacent

Answer 20

BV
Bones
Joints
Ligs

Question 21

Subcostal N is the ____ of thoracic nerves

Answer 21

Largest

Question 22

Intercostal also contributes to

Answer 22

Lumbar plexus

Question 23

Subcostal N may supply skin as far inferior as

Answer 23

Superior buttocks

Question 24

Each T nerve communicates w/ sympathetic trunk by

Answer 24

Gray and white rami communicans

Question 25

Gray ramus is ___ to white ramus

Answer 25

Medial

Question 26

Gray rami communicans

Answer 26

Postganglionic sympathetic

NOT myelinated

Question 27

White rami communicans

Answer 27

Preganglionic sympathetic

Myelinated