Anatomy EX2 - Nerves Flashcards Preview

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Flashcards in Anatomy EX2 - Nerves Deck (46)
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1

Phrenic n.

- Originates from C3-C5 spinal segments
- Explains paralysis of diaphragmatic respiration from cervical cord injuries
- Paralyzed hemidiaphragm cannot contract (descend) , remains high in thorax, recognizable on radiographic chest films

2

What are the nerves of the Anterior Abdominal Wall?

- Ventral rami of T7-L1 spinal nn.
- They run between IO and TA mm.

3

Which ventral rami supply region above umbilicus?

- T7, T8 & T9

4

Which ventral ramus supplies umbilicus region?

- T10

5

Which ventral rami supply region below umbilicus?

- T11, T12 & L1

6

What does injury to T11, T12, & L1 result in?

- weakens mm in inguinal region
- Predisposes to developing direct inguinal hernias

7

Innervation to viscera is via ....

autonomic n. plexuses

8

Sympathetic fibers that inverted viscera originate from ....

T5-L2(3) – thoracolumbar

9

Parasympathetic fibers that inverted viscera originate from ....

CN X & S2-4 
– craniosacral

10

Parasympathetic synapses in abdomen occur ...

- within effector organs

11

Preganglionic nerves from CN X to abdomen travel on ....

- upper arterial branches, celiac trunk, SMA, renal aa, and all their branches

12

Preganglionic nerves from S2-S4 to abdomen travel on ....

- lower arterial branches, IMA and branches

13

Preganglionic sympathetics going to abdomen synapse in ...

- collateral ganglia

14

Postganglionic sympathetics in abdomen leave ganglia ...

- reach effector organs

15

Post-synaptic sympathetics in abdomen travel on ...

- all main arterial branches, celiac trunk, SMA, renal aa, IMA and all their branches

16

The Celiac Ganglion plexus travels with ...

- Celiac brs.

17

The Superior Mesenteric Ganglion plexus travels with ...

- SMA brs.

18

The Aorticorenal Ganglion plexus travels with ...

- renal brs.

19

The Inferior mesenteric ganglion plexus travels with ...

- IMA brs.

20

The Celiac Ganglion, the Superior Mesenteric Ganglion, the Aorticorenal Ganglion & all receive ...

- thoracic splanchnic nn & CN X brs

21

The Inferior mesenteric ganglion receives ...

- lumbar splanchnic nn & S2-S4 brs

22

What are the nerves of the posterior abdominal wall?

- Ventral rami T12-L4
- Lumbar plexus of nn., located beneath fascia of posterior abd. mm.

23

Subcostal n. (T12)

- ~1cm inferior to 12th rib
- Supplies sensory to ant./lat. abd. wall
- Supplies motor to abdominal mm.: EO, IO, TA, pyramidalis, RA, QL

24

Iliohypogastric & Ilioinguinal Nn. (L1)

- Can arise from common trunk
descend ant. to QL
- Iliohypogastric n. supplies skin of suprapubic region
- Ilioinguinal n. runs thru inguinal call to supply it
- Both also supply abd. mm.

25

Lateral Femoral Cutaneous N. (L2-L3)

- Descends ant. to iliacus m.
- Passes deep to inguinal ring
- Inferior to ASIS
- Supplies ant./lat. skin of thigh

26

Femoral N. (L2-L4)

- Runs between iliacus & psoas major mm.
- Passes deep to inguinal ligament
- Inferior to ASIS
- Supplies sensory & motor to anterior thigh

27

Genitofemoral N. (L1-L2)

- Pierces psoas major m.
- descends along ant. surface
- Splits to femoral br. & genital br.
- Supplies skin inf. & med. to inguinal ligament
- Supplies cremaster m. (of spermatic cord)

28

Obturator N. (L2-L4)

- Runs medial to psoas major mm.
- Passes thru obturator foramen
- Supplies sensory & motor to medial thigh

29

Lumbosacral Trunk (L4-L5)

- Large n. trunk crosses over ala of sacrum
- Descends into pelvis to help form sacral plexus
- Provides general contributions to both plexuses

30

Sacral Plexus (L4-S4)

-Somatic innervation
Forms 3 nn.:
-Sciatic & Gluteal nn
-Pudendal n.