Exam 3 Muscles Flashcards Preview

Gross Anatomy 2 > Exam 3 Muscles > Flashcards

Flashcards in Exam 3 Muscles Deck (60):
1

Origin: External Intercostal

Inferior border of rib

2

Insertion: External Intercostal

Superior border of ribs below

3

Innervation: External Intercostal

Intercostal Nerve

4

Main Action: External Intercostal

During forced inspiration: elevate ribs

5

Origin: Internal Intercostal

Inferior border of rib

6

Insertion: Internal Intercostal

Superior border of rib below

7

Innervation: Internal Intercostal

Intercostal Nerve

8

Main Action: Internal Intercostal

During forced inspiration: interosseous part depresses ribs; interchondral part elevates ribs

9

Origin: Innermost Intercostal

Inferior border of ribs

10

Insertion: Innermost Intercostal

Superior border of ribs below

11

Innervation: Innermost Intercostal

Intercostal Nerve

12

Main Action: Innermost Intercostal

During forced inspiration: interosseous part depresses ribs; interchondral part elevates ribs

13

Origin: Transverse Thoracic

Posterior surface of lower sternum

14

Insertion: Transverse Thoracic

Internal surface of costal cartilages 2-6

15

Innervation: Transverse Thoracic

Intercostal Nerve

16

Main Action: Transverse Thoracic

Weakly depresses ribs

17

Origin: External Oblique

External Surfaces of 5th-12th ribs

18

Insertion: External Oblique

Linea alba
Pubic tubercle
Anterior half of iliac crest

19

Innervation: External Oblique

Thoraco-abdominal Nerves (anterior rami T7-T11) and subcostal nerve

20

Main Action: External Oblique

Compress and support abdominal viscera
Flex and rotate trunk

21

Origin: Internal Oblique

Thoracolumbar Fascia
Anterior 2/3 or iliac crest
CT deep to inguinal ligament

22

Insertion: Internal Oblique

Inferior borders of 10th-12th ribs
Linea Alba
Pubis via conjoint tendon

23

Innervation: Internal Oblique

Thoraco-abdominal Nerves (anterior rami T7-T11), subcostal and 1st lumbar nerve

24

Main Action: Internal Oblique

Compress and support abdominal viscera
Flex and rotate trunk

25

Origin: Transversus Abdominis

Internal surfaces of 7th-12th costal cartilages, thoracolumbar fascia, iliac crest, CT deep to inguinal ligament

26

Insertion: Transversus Abdominis

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

27

Innervation: Tranversus Abdominis

Thoraco-abdominal Nerves (anterior rami T7-T11), subcostal and 1st lumbar nerve

28

Main Action: Transversus Abdominis

Compresses and supports abdominal viscera

29

Origin: Rectus Abdominis

Pubic symphysis and pubic crest

30

Insertion: Rectus Abdominis

Xiphoid process and 5th-7th costal cartilages

31

Innervation: Rectus Abdominis

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

32

Main Action: Rectus Abdominis

Flexes trunk (lumbar vertebrae) and compresses abdominal viscera
Stabilizes and controls tilt of pelvis (antilordosis)

33

Origin: Psoas Major

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

34

Insertion: Psoas Major

Lesser trochanter of femur

35

Innervation: Psoas Major

Lumbar plexus via anterior branches of nerves L2-L4

36

Main Action: Psoas Major

Acting inferiorly with iliacus: flexes thigh
Acting superiorly: flexes vertebral column laterally to balance the trunk
When sitting: acts inferiorly with iliacus to flex trunk

37

Origin: Iliacus

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

38

Insertion: Iliacus

Lesser trochanter of femur and shaft inferior to Psoas major tendon

39

Innervation: Iliacus

Femoral nerve (L2-L4)

40

Main Action: Iliacus

Flexes thigh and stabilizes hip joint
Acts with Psoas major

41

Origin: Quadratus Lumborum

Medial half of inferior border of 12th rib and tips of lumbar transverse process

42

Insertion: Quadratus Lumborium

Iliolumbar ligament and internal lip of iliac crest

43

Insertion: Quadratus Lumborum

Iliolumbar ligament and internal lip of iliac crest

44

Main Action: Quadratus Lumborum

Extends and laterally flexes vertebral column
Flexes 12th rib during inspiration

45

Origin: Obturator Internus

Pelvic surface of the ilium and ischium
Obturator membrane

46

Insertion: Obturator Internus

Greater trochanter of the femur

47

Insertion: Obturator Internus

Nerve to Obturator Internus

48

Main Action: Obturator Internus

Laterally rotates hip joint
Assists in holding head of femur in acetabulum

49

Origin: Piriformis

Pelvic surface of 2nd-4th sacral segments
Superior margin of greater sciatic notch
Sacrotuberous ligament

50

Insertion: Piriformis

Greater trochanter

51

Innervation: Piriformis

Anterior rami of S1 and S2

52

Main Action: Piriformis

Laterally rotates hip joint
Abducts hip joint
Holds head of femur in acteabulum

53

Origin: Levator Ani

Body of pubis
Tendinous arch of levator ani
Ischial spine

54

Insertion: Levator Ani

Perineal body
Coccyx
Anococcygeal ligament
Walls of prostate or vagina
Rectum
Anal canal

55

Innervation: Levator Ani

Nerve to Levator Ani (branches of S4)
Inferior anal (rectal) nerve
Coccygeal plexus

56

Main Action: Levator Ani

Helps support pelvic viscera
Resists increases in intra-abdominal pressure

57

Origin: Coccygeous

Ischial spine

58

Insertion: Coccygeous

Inferior end of sacrum and coccyx

59

Innervation: Coccygeous

Branches of S4 and S5 nerves

60

Main Action: Coccygeous

Forms small part of pelvic diaphragm that supports pelvic viscera
Flexes coccyx