WEEK 2 NEURO BRACHIAL PLEXUS

Question 1

Functional unit of nervous system?

Answer 1

Neuron (cell type)

Question 2

Dendrites

Answer 2

Input info

Question 3

Axon

Answer 3

Output info

Question 4

Motor neurons typically?

Answer 4

Multipolar

Question 5

Sensory neurons typically?

Answer 5

Pseudounipolar

Question 6

Nervous system divided into two groups?

Answer 6

By structure. 1) central nervous system 2) peripheral nervous system

Question 7

CNS

Answer 7

Brain and spinal chord

Question 8

PNS

Answer 8

Nervous tissue outside of brain and spinal chord

Question 9

Are the two nervous systems integrated?

Answer 9

YES. Work together.

Question 10

Afferent fibers

Answer 10

Impulses to the CNS from sensory receptors

Question 11

Efferent fibers

Answer 11

Impulses away from the CNS to effector organs

Question 12

What nervous system is the cranial nerve a part of?

Answer 12

PNS

Question 13

How many cervical nerves are there? Why is this special?

Answer 13

8, because there are only 7 cervical vertebrae

Question 14

Cervical vertebrae have nerves emerging?

Answer 14

SUPERIOR to their corresponding vertebrae

Question 15

Spinal nerves T1-Co1 emerge?

Answer 15

Inferior to their corresponding vertebrae

Question 16

What is special about C8 nerve?

Answer 16

It does not have a corresponding vertebrae, emerges below C7, is a transitional nerve

Question 17

Gray matter

Answer 17

Cells bodies of nerves (make an H shape)

Question 18

White matter

Answer 18

Axons of nerves (surround H shape)

Question 19

Dorsal horns for what info?

Answer 19

Sensory

Question 20

Ventral horns for what info?

Answer 20

Motor

Question 21

General flow of impulses?

Answer 21

1) sensory info= in from periphery, into posterior /dorsal horn, sent to brain
2) motor= from brain, synapse on neurons from VENTRAL horn, info leaves

Question 22

Another term for anterior?

Answer 22

Ventral

Question 23

Another term for posterior?

Answer 23

Dorsal

Question 24

Mixed spinal nerves are composed of both?

Answer 24

Afferent and efferent nerve fibers

Question 25

Dorsal rami?

Answer 25

Only supplies deep back and skin, small

Question 26

Ventral rami

Answer 26

Supplies everything except deep back, LARGE

Question 27

Dermatome

Answer 27

Patch of skin innervated by a certain segment

Question 28

Myotome

Answer 28

Muscle innervated by a certain segment

Question 29

Nerve plexuses are comprised of?

Answer 29

VENTRAL RAMI from several spinal nerves.

Question 30

Brachial plexus is the ventral rami from?

Answer 30

C5-T1, both afferent and efferent fibers

Question 31

Each spinal nerve contributes to several?

Answer 31

Peripheral nerves

Question 32

Motor fibers in a spinal nerve generally supply?

Answer 32

More than 1 muscle

Question 33

Anatomical Insurance

Answer 33

The idea that muscles receive fibers from more than 1 spinal nerve and each peripheral nerve of a plexus contains fibers from several spinal nerves. IT IS PROTECTION from loss of function

Question 34

Roots of brachial plexus?

Answer 34

C5-T1

Question 35

Trunks of brachial plexus?

Answer 35

Superior, middle and inferior

Question 36

Divisions of brachial plexus?

Answer 36

Anterior and posterior divisions of all three trunks (superior, middle, inferior)

Question 37

Cords of brachial plexus?

Answer 37

Lateral, medial, posterior

Question 38

Terminal branches of brachial plexus?

Answer 38

Ulnar, median, radial, axillary, musculocataneous

Question 39

The brachial plexus is named relative to?

Answer 39

The axillary artery that runs in the middle (aka anterior divisions runs anteriorly to axillary artery)

Question 40

All plexuses are made of dorsal or ventral rami?

Answer 40

Ventral

Question 41

What nerves make the M structure?

Answer 41

Musculocutaneous, median, and ulnar nerves