Unit 2 innervation/action of muscles Flashcards Preview

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Flashcards in Unit 2 innervation/action of muscles Deck (25):
1

Intercostal (external) m

elevation of the ribs, intercostal nerve

2

Intercostal (internal) m

depression of the ribs, intercostal nerve

3

Transversus thoracis

depress ribs, intercostal nerves

4

Cremaster

elevation of testis, genitofemoral nerve

5

Diaphragm

inspiration (negative thoracic pressure by inferior displacement), phrenic nerve

6

External oblique

flexion and rotation of the trunk, compression of the abdominal cavity, ventral rami T7-12

7

Internal oblique

flexion and rotation of the trunk, compression of the abdominal cavity, innervated by the lower thoracic and L1 ventral rami

8

Quadratus Lumborum

extension and lateral flexion of the trunk, fixes 12th rib during respiration, ventral rami T12-L3

9

Rectus abdominis

flexion of trunk and compression of abdominal cavity, lower thoracic ventral rami

10

Transversus abdominis

compression of the abdominal cavity, lower thoracic and L1 ventral rami

11

Coccygeus

supports and compresses the posterior pelvic floor, ventral rami S4-5

12

Levator ani

supports pelvic viscera, compresses rectum and vagina. pudendal nerve (inferior rectal branches) and S4.

13

Bulbospongiosus

In male, empties urethra, maintains erection, and contracts during ejaculation; in female constricts vaginal orifice and contributes to erection of clitoris. Innervated by perineal branch of pudendal nerve

14

ischiocavernosus

compresses crus during erection. perineal branch of the pudendal nerve

15

Sphincter ani externus

closes anal canal and fixes perineal body. inferior rectal branch of pudendal nerve

16

Sphincter urethrae

compresses urethra, perineal branch of pudendal nerve

17

compressor urethrae

compresses urethra, perineal branch of pudendal nerve

18

sphincter urethrovaginalis

compresses urethra and vagina, perineal branch of pudendal nerve

19

deep transverse perineus

fixes perineal body, perineal branch of pudendal nerve

20

superficial transverse perineus

fixes perineal body, perineal branch of the pudendal nerve

21

sensory/post symp to proximomedial thigh, root of the penis/scrotum or mons pubis and labia majora, muscles of the anterior abdominal wall

Ilioinguinal nerve

22

Muscles of anterior abdominal wall

iliohypogastric, ilioinguinal

23

skin overlying labium majorum/scrotum, cremaster muscle

Specifically, the genital branch of the genitofemoral nerve (L1-L2)

24

skin overlying the femoral triangle

the Femoral branch of the genitofemoral nerve (only sensory/post-symp)

25

Psoas, quadratus lumborum muscles

Muscular branches off the lumbar ventral rami