Lumbosacral Plexus Flashcards Preview

COM Anatomy, Biochemistry, OS > Lumbosacral Plexus > Flashcards

Flashcards in Lumbosacral Plexus Deck (29):
1

Name all the nerves in the sacral trunk

Superior gluteal n.
Inferior gluteal n.
Nerve to periformis
Common fibular n.
Sciatic n (tibial branch)
quadratus femoris/Inferior gemellus
Obturator internus/superior gemellus
Posterior femoral cutaneous n.
perforating cutaneous n.
pudendal n.

2

Lumbar plexus

VENTRAL PRIMARY RAMI!

T12-L4/L5

carry autonomics (sympathetic/parasympathetic)

3


L4/L5 of lumbar plexus

form to contribute the first branch of the sacral plexus

4

Subcostal n @

T12

5

iliohypogastric n @

T12/L1

6

Ilioinguinal n. @

L1

7

Lumbosarcal trunk

L4/L5

8

Femoral n. (posterior divisions)

L2, L3, L4

9

Obturator n (antieror divisions)

L2/L3/L4

10

most branches of lumbar plexus are associated with what muscle?

psoas m.

11

Lumbar plexus: name all the nerves

subcostal
iliohypogastric
ilioinguinal
genitofemoral
lateral femoral cutaneous
femoral
obturator
lumbosacral trunk

12

ANS

invol. or uncon. control
two neuron pw
ganglial involved in pw
sensory input from general and visceral senses, motor output to cardiac, smooth muscle and gland

can exist or inhibit function using acetylcholine/norepinephrine
axons thin, some myelinated

13

SNS

voluntary or subconscious
no ganglia involved in pw
sensory input from and special sense, motor output to skeletal muscle

excites using acetylcholine
axons are thick and myelinated

14

Greater splanchnic n.

T5-T9

15

Lesser splanchnic n.

T10-T11

16

Least splanchnic n.

T12-L2

17

Lumbar splanchnic n.

L1-L2

18

Sacral splanchnic n.

1, 2, 3rd sacral ganglia

19

Pelvic splanchnic n.

S2-S4

20

sympathetic plexuses =

collections of postganglionic axons

from spinal cord via sym. trunk

21

parasympathetic plexuses =

collections of preganglionic axons

from cranial and caudal origins

22

sym and para sym plexi interactions

they don't.

23

cardiac plexus: sym vs para sym

sym: increases heart rate/blood pressure
parasym: decreases heart rate

24

Hypogastric plexus

innervates pelvic viscera, which is autonomic control of urinary and reproductive function

25

Parasympathetic axons

preganglionic axon is myelinated and long, postganglionic is short and unmyelinated

26

sympathetic axons

preganglionic is short, branched, and myelinated
postganglionic is long and unmyelinated

27

mass action

a large number of ganglionic neurons activate many effector organs

28

Sympathetic division:

how preganglionic axons travel,
where their neurons are housed

neurons in the lateral horns of T1-L2

travel with somatic motor neurons to exit the spinal cord, and first enter the anterior root and then the T1-L2 spinal nerves

29

Left/Right Sympathetic Trunks

one sympathetic ganglion is associated with each vertebra except in the cervical region where there is a superior, middle, and inferior ganglia