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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
Origin of Transversus Abdominis
internal surfaces of 7th-12th costal cartilages, thoracolumbar fascia, iliac crest, and connective tissue deep to inguinal ligament
25
Insertion of Transversus Abdominis
linea alba with aponeurosis of internal oblique, pubic crest, and pubis via conjoint tendon
26
Innervation of Transversus Abdominis
thoraco-abdominal nerves (anterior rami of T7-T11), subcostal and first lumbar nerve
27
Actions of Transversus Abdominis
compresses and supports abdominal viscera
28
Origin of Rectus Abdominis
pubic symphysis and pubic crest
29
Insertion of Rectus Abdominis
xiphoid process and 5th-7th costal cartilages
30
Innervation of Rectus Abdominis
thoraco-abdominal and subcostal nerves (anterior rami of T7-T12 spinal nerves)
31
Actions of Rectus Abdominis
flexes trunk (lumbar vertebrae) and compresses abdominal viscera, stabilizes and controls tilt of pelvis (antilordosis)
32
Origin of Psoas Major
transverse processes of lumbar vetebrae; sides of bodies of T12-S1 vertebrae and intervening IV discs
33
Insertion of Psoas Major
by a strong tendon to lesser trochanter of femur
34
Innervation of Psoas Major
lumbar plexus via anterior branches of nerves L2-L4
35
Actions of Psoas Major
inferiorly, flexes thigh; superiorly, flexes vertebral column laterally to balance the trunk; when sitting, acts inferiorly to flex trunk
36
Origin of Iliacus
superior 2/3 of iliac fossa, ala of sacrum, and anterior sacro-iliac ligaments
37
Insertion of Iliacus
lesser trochanter of femur and shaft inferior to it and to psoas major tendon
38
Innervation of Iliacus
femoral nerve (L2-L4)
39
Actions of Iliacus
flexes thigh and stabilizes hip joint; acts with psoas major
40
Origin of Quadratus Lumborum
medial 1/2 of inferior border of 12th rib and tips of lumbar transverse processes
41
Insertion of Quadratus lumborum
iliolumbar ligament and internal lip of iliac crest
42
Innervation of Quadratus lumborum
anterior branches of T12 and L1-L4 nerves
43
Actions of Quadratus lumborum
extends and laterally flexes vertebral column; fixes 12th rib during inspiration
44
Origin of Levator ani
body of pubis, tendinous arch of levator ani, ischial spine
45
Insertion of Levator ani
perineal body, coccyx, anococcygeal ligament, walls of prostate or vagina, rectum, anal canal
46
Innervation of Levator ani
nerve to levator ani (branches of S4), inferior anal (rectal) nerve, coccygeal plexus
47
Actions of Levator ani
helps support pelvic viscera; resists increases in intra-abdominal pressure
48
Origin of Coccygeus
ischial spine
49
Insertion of Coccygeus
inferior end of sacrum and coccyx
50
Innervation of Coccygeus
branches of S4 and S5 nerves
51
Actions of Coccygeus
forms small part of pelvic diaphragm that supports pelvic viscera; flexes coccyx
52
Origin of Obturator internus
pelvic surface of ilium and ischium; obturator membrane
53
Insertion of Obturator internus
greater trochanter of femur
54
Innervation of Obturator internus
nerve to obturator internus (L5, S1, S2)
55
Actions of Obturator internus
laterally rotates hip joint; assists in holding head of femur in acetabulum
56
Origin of Piriformis
pelvic surface of 2nd-4th sacral segments; superior margin of greater sciatic notch and sacrotuberous ligament
57
Insertion of Piriformis
greater trochanter of femur
58
Innervation of Piriformis
anterior rami of S1 and S2
59
Actions of Piriformis
laterally rotates hip joint; abducts hip joint; assists in holding head of femur in acetabulum
60
Origin of External anal sphincter
skin and fascia surrounding anus and coccyx via anococcygeal ligament
61
Insertion of External anal sphincter
passes around lateral aspects of anal canal, inserting into perineal body
62
Innervation of External Anal Sphincter
inferior anal nerve, branch of pudendal nerve (S2-S4)
63
Actions of External Anal Sphincter
constricts anal canal during peristalsis, resisting defecation; supports and fixes perineal body/pelvic floor

Muscles (4 decks)

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