Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Anatomy (Pharm 110) > 7.3 Spinal nerves > Flashcards

7.3 Spinal nerves Flashcards

1
Q

how many spinal nerves are there

A

31 pairs of mixed nerves

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

what is dermatome

A
  • area of skin innervated by cutaneous branches of a single spinal nerve

*all spinal nerves except C1 innervate skin

  • most dermatomes overlap
  • way of determining site of spinal cord damage (see what they feel above and below site)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Describe spinal nerve innervation of joints

A

hiltons law

  • any nerve serving a nuslce that produces movement at a joint also innervates the joint and the skin over the joint

(also provides sensroy)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

describe roots of the spinal nerve

A

Spinal chord -> Rootlets -> root -> spinal nerve -> rami

  • doral and ventral rootlets: come together to foem a root
  • dorsal root and ventral root

*roots/rootlets and only be motor or sensory

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Describe the rami of spinal nervess

A

each spinal nerve branches into 4 mixed rami:

  1. meningeal branch: to spinal meninges & blood vessels
  2. dorsal ramus: to posterior bdoy trunk (deep muscles of back)
  3. ventral ramus: form plexuses (except T2-T12: act as itnercostal nerves -> muscles of ribs, anterolateral thorax & abdonimal wall

*intercostal nerves that run beteen ribs

  1. rami communicantes: autonomic pathways (join to ventral remi in thoacic region)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Why do we have a plexus of ventral rami

A

*looks like mesh

  • fibers from various ventral rami crisscross & become redistributed so:
  • > each resulting branch has fibers from several spinal nerves
  • > fibers from each ventral ramus travel to target via seveeral routes

result: each muscle in limb receives nerve suply from more than one spinal nerve

benefit: demaging one spinal segment/root will not completely paralyze any limb muscle

*plexus gives lots of back up

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Describe the cervial plexus

A

ventral rami: C1-C5

  • innervates skin & muscles of neck, ear, back of head and shoulders

*C345 keeps diaphragm alive -> forms Phrenic nerve that innervates diaphragm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

describe brachial plexus

A
  • formed by ventral rami of C5-C8, and T1
  • gives rise to nerves that innervate upper limb & pectoral girdle (motor and sensory)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

what are the major branches of the brachial plexus

A

Rugby Teams Drink Cold Beer

  • Roots (ventral rami)
    • C5, C6, C7, C8, T1
  • Trunks
    • upper, middle, lower
  • Divisions
    • Anterior or posteriro
  • Chords
    • Lateral, medial, posterior
  • Bracnches (major termial branches -> peripheral nerves)
    • musculocutaneous, medial, ulnar, radial and axillary
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

How to draw brachial plexus

A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

General function of brachial plexus:

Radial nerve

A

Motor: most posterior muscles of limb

Sensory: posterior skin of limb

*goes down posterior aspect of upper limb (extensors)

*allows to extend wrist against gravity

*C5-8 and T1

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

brachial plexus: General functions

Axillary nerve

A

*arm pit

Motor: deltoid, teres minor (shoulder abduction)

sensory: skin & joint capsule of shoulder

*innercation from C5&6

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

General function of brachial plexus:

musculocutaneous

A

elbow flex and bicep flex

  • Motor: anterior arm muscles (musculo)
    sensory: skin of lateral forarm (cutaneous)

*innervation from C5,6 and 7

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

General function of brachial plexus:

nedian nerve

A

*nothing in arm, just forarm and hand

motor: lateral flexors & pronators in forarm + some lateral intrinsic muscles of hand
sensory: skin of lateral aspect of hand

*innervation from C5,6,7,8 and T1

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

General function of brachial plexus:

Ulnar nerve

A

*forarem -> ulnar bone is medial so this does the medial forarm msucles

Motor: anterior medial forearm msucles + most medial intrinsic muscles of hand

Sensory: skin of medial aspect of hand

*innerved by nerves C8 and T1

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

what would happen if lateral chord of the left brachial plexus was completely severed

A
17
Q

describe lumbar plexus, what nerves are part of it

A
  • innervate thigh, abdominal wall and psoas muscles
  • obturator nerve: passes through obturator foramen to innervate adductor muscles

*into medial thigh

femorla nerve: innervates anterior thigh muscles of skin of anteiror/medial tigh and medial leg (goes in front)

18
Q

Describe Sacral plexus and assocaited nerves

A

*comes off sacral aspect of spinal chord

  • serves buttock, lower limb, pelvic structures and perineum
  • Pudendal nerve: skin/muscles of perineum

-Sciatic nerve: longest/thickest nerve of body

  • > runs posteriorly
  • > innervates hamstrings, adductor magnus and most muslces in leg and foot
  • > composed of tibial and common fibular nerves
19
Q

a tight ____ can impact siactic muscle

A

piri formis

20
Q

where to give gluteal nijection

A

*DONT WANT TO HIT SCIATIC

  • aim for superior lateral quad

Anatomy (Pharm 110) (41 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions