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Muscles > Thorax, Abdomen, and Pelvis > Flashcards

Thorax, Abdomen, and Pelvis Flashcards

0
Q

Insertion of External Intercostal

A

superior border of ribs below

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1
Q

Origin of External Intercostal

A

inferior border of ribs

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2
Q

Innervation of External Intercostal

A

intercostal nerve

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3
Q

Actions of External Intercostal

A

during forced inspiration; elevates ribs

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4
Q

Origin of Internal Intercostal

A

inferior border of ribs

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5
Q

Insertion of Internal Intercostal

A

superior border of ribs below

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6
Q

Innervation of Internal Intercostal

A

intercostal nerve

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7
Q

Actions of Internal Intercostal

A

during forced respiration; interosseous part depresses ribs; interchondral part elevates ribs

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8
Q

Origin of Innermost Intercostal

A

inferior border of ribs

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9
Q

Insertion of Innermost Intercostal

A

superior border of ribs below

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10
Q

Innervation of Innermost Intercostal

A

intercostal nerve

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11
Q

Actions of Innermost Intercostal

A

during forced respiration: interosseous part depresses ribs; interchondral part elevates ribs

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12
Q

Origin of Transversus Thoracis

A

posterior surface of lower sternum

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13
Q

Insertion of Transversus Thoracis

A

internal surface of costal cartilages 2-6

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14
Q

Innervation of Transversus Thoracis

A

intercostal nerve

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15
Q

Actions of Transversus Thoracis

A

weakly depresses ribs

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16
Q

Origin of External Oblique

A

external surfaces of 5th-12th ribs

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17
Q

Insertion of External Oblique

A

linea alba, pubic tubercle, and anterior half of iliac crest

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18
Q

Innervation of External Oblique

A

thoraco-abdominal nerves (anterior rami of T7- T11) and subcostal nerve

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19
Q

Actions of External Oblique

A

compress and support abdominal viscera; flex and rotate trunk

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20
Q

Origin of Internal Oblique

A

thoracolumbar fascia, anterior 2/3 of iliac crest, and connective tissue deep to inguinal ligament

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21
Q

Insertion of Internal Oblique

A

inferior borders of 10th-12th ribs, linea alba, and pubis via conjoint tendon

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22
Q

Innervation of Internal Oblique

A

thoraco-abdominal nerves (anterior rami T7-T11), subcostal and first lumbar nerve

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23
Q

Actions of Internal Oblique

A

compress and support abdominal viscera; flex and rotate trunk

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24
Q

Origin of Transversus Abdominis

A

internal surfaces of 7th-12th costal cartilages, thoracolumbar fascia, iliac crest, and connective tissue deep to inguinal ligament

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25
Q

Insertion of Transversus Abdominis

A

linea alba with aponeurosis of internal oblique, pubic crest, and pubis via conjoint tendon

26
Q

Innervation of Transversus Abdominis

A

thoraco-abdominal nerves (anterior rami of T7-T11), subcostal and first lumbar nerve

27
Q

Actions of Transversus Abdominis

A

compresses and supports abdominal viscera

28
Q

Origin of Rectus Abdominis

A

pubic symphysis and pubic crest

29
Q

Insertion of Rectus Abdominis

A

xiphoid process and 5th-7th costal cartilages

30
Q

Innervation of Rectus Abdominis

A

thoraco-abdominal and subcostal nerves (anterior rami of T7-T12 spinal nerves)

31
Q

Actions of Rectus Abdominis

A

flexes trunk (lumbar vertebrae) and compresses abdominal viscera, stabilizes and controls tilt of pelvis (antilordosis)

32
Q

Origin of Psoas Major

A

transverse processes of lumbar vetebrae; sides of bodies of T12-S1 vertebrae and intervening IV discs

33
Q

Insertion of Psoas Major

A

by a strong tendon to lesser trochanter of femur

34
Q

Innervation of Psoas Major

A

lumbar plexus via anterior branches of nerves L2-L4

35
Q

Actions of Psoas Major

A

inferiorly, flexes thigh; superiorly, flexes vertebral column laterally to balance the trunk; when sitting, acts inferiorly to flex trunk

36
Q

Origin of Iliacus

A

superior 2/3 of iliac fossa, ala of sacrum, and anterior sacro-iliac ligaments

37
Q

Insertion of Iliacus

A

lesser trochanter of femur and shaft inferior to it and to psoas major tendon

38
Q

Innervation of Iliacus

A

femoral nerve (L2-L4)

39
Q

Actions of Iliacus

A

flexes thigh and stabilizes hip joint; acts with psoas major

40
Q

Origin of Quadratus Lumborum

A

medial 1/2 of inferior border of 12th rib and tips of lumbar transverse processes

41
Q

Insertion of Quadratus lumborum

A

iliolumbar ligament and internal lip of iliac crest

42
Q

Innervation of Quadratus lumborum

A

anterior branches of T12 and L1-L4 nerves

43
Q

Actions of Quadratus lumborum

A

extends and laterally flexes vertebral column; fixes 12th rib during inspiration

44
Q

Origin of Levator ani

A

body of pubis, tendinous arch of levator ani, ischial spine

45
Q

Insertion of Levator ani

A

perineal body, coccyx, anococcygeal ligament, walls of prostate or vagina, rectum, anal canal

46
Q

Innervation of Levator ani

A

nerve to levator ani (branches of S4), inferior anal (rectal) nerve, coccygeal plexus

47
Q

Actions of Levator ani

A

helps support pelvic viscera; resists increases in intra-abdominal pressure

48
Q

Origin of Coccygeus

A

ischial spine

49
Q

Insertion of Coccygeus

A

inferior end of sacrum and coccyx

50
Q

Innervation of Coccygeus

A

branches of S4 and S5 nerves

51
Q

Actions of Coccygeus

A

forms small part of pelvic diaphragm that supports pelvic viscera; flexes coccyx

52
Q

Origin of Obturator internus

A

pelvic surface of ilium and ischium; obturator membrane

53
Q

Insertion of Obturator internus

A

greater trochanter of femur

54
Q

Innervation of Obturator internus

A

nerve to obturator internus (L5, S1, S2)

55
Q

Actions of Obturator internus

A

laterally rotates hip joint; assists in holding head of femur in acetabulum

56
Q

Origin of Piriformis

A

pelvic surface of 2nd-4th sacral segments; superior margin of greater sciatic notch and sacrotuberous ligament

57
Q

Insertion of Piriformis

A

greater trochanter of femur

58
Q

Innervation of Piriformis

A

anterior rami of S1 and S2

59
Q

Actions of Piriformis

A

laterally rotates hip joint; abducts hip joint; assists in holding head of femur in acetabulum

60
Q

Origin of External anal sphincter

A

skin and fascia surrounding anus and coccyx via anococcygeal ligament

61
Q

Insertion of External anal sphincter

A

passes around lateral aspects of anal canal, inserting into perineal body

62
Q

Innervation of External Anal Sphincter

A

inferior anal nerve, branch of pudendal nerve (S2-S4)

63
Q

Actions of External Anal Sphincter

A

constricts anal canal during peristalsis, resisting defecation; supports and fixes perineal body/pelvic floor

Muscles (4 decks)

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