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MSK > Muscles of the trunk > Flashcards

Muscles of the trunk Flashcards

1
Q

Origin of external intercostal muscles

A

Inferior margin of ribs.

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2
Q

Insertion of external intercostal muscles

A

Superior margin of ribs below

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3
Q

Action of external intercostal muscles

A

Elevate ribs during forced inspiration

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4
Q

Innervation of external intercostal muscles

A

Anterior rami of T1-T11

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5
Q

Origin of internal intercostal muscles

A

Superior margin of ribs below.

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6
Q

Insertion of internal intercostal muscles

A

Inferior lateral edge of costal grooves above

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7
Q

Action of internal intercostal muscles

A

Depresses ribs during forced expiration

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8
Q

Innervation of internal intercostal muscles

A

Anterior rami of T1-T11

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9
Q

Origin of innermost intercostal muscles

A

Deep surface of ribs below

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10
Q

Insertion of innermost intercostal muscles

A

Medial edge of costal grooves

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11
Q

Action of innermost intercostal muscles

A

Depresses ribs during forced expiration

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12
Q

Innervation of innermost intercostal muscles

A

Anterior rami of T1-T11

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13
Q

Origin of transversus thoracic muscles

A

Posterior aspect of xiphoid process, inferior aspect of sternum, adjacent costal cartilages of lower true ribs.

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14
Q

Insertion of transversus thoracic muscles

A

Lower border of costal cartilages of Rib 3-6

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15
Q

Action of transversus thoracic muscles

A

Depresses costal cartilages. Active during forced respiration.

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16
Q

Innervation of transversus thoracic muscles

A

Anterior rami of T1-T11

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17
Q

Origin of psoas major muscle

A

Body, Intervertebral discs and Transverse processes of T12, L1-L5

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18
Q

Insertion of psoas major muscle

A

Lesser trochanter of Femur

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19
Q

Action of psoas major muscle

A

Flexes thigh at hip joint when trunk stabilized, flexes trunk when body is supine.

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20
Q

Innervation of psoas major muscle

A

Anterior rami of L1-L3

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21
Q

Origin of psoas minor muscle

A

Body of T12 and L1

22
Q

Insertion of psoas minor muscle

A

Pectineal line and Iliopubic eminence

23
Q

Innervation of psoas minor muscle

A

Anterior rami of L1

24
Q

Action of psoas minor muscle

A

Weak flexor of lumbar vertebral column

25
Q

Origin of quadratus lamborum

A

Transverse process of L5, Iliac Crest, Iliolumbar process

26
Q

Insertion of quadratus lamborum

A

Transverse processes of L1-L4, Inferior border of rib 12

27
Q

Innervation of quadratus lamborum

A

Anterior rami of T12, L1-L4.

28
Q

Action of quadratus lamborum

A

Depresses and stabilizes Rib 12, lateral bending of trunk, both muscles together extend trunk

29
Q

Origin of iliacus muscle

A

Iliac fossa.

30
Q

Insertion of iliacus muscle

A

Joins with Psoas major to insert on lesser trochanter of Femur

31
Q

Innervation of iliacus muscle

A

Femoral nerve.

32
Q

Action of iliacus muscle

A

Flexes thigh at hip joint and flexes trunk when supine

33
Q

Origin of external oblique

A

Lower six rib shafts (T7-T12).

34
Q

Insertion of external oblique

A

Linea alba, pubic tubercle.

35
Q

Innervation of external oblique

A

Thoracoabdominal nerves (T7-T11 anterior rami).

36
Q

Action of external oblique

A

Flexion of torso

37
Q

Origin of internal oblique

A

Inguinal ligament, iliac crest.

38
Q

Insertion of internal oblique

A

Linea alba, Ribs 10-12.

39
Q

Innervation of internal oblique

A

Thoracoabdominal nerves (T7-T11 anterior rami) and Subcostal nerve.

40
Q

Action of internal oblique

A

Flexion of trunk

41
Q

Origin of transversalis abdominus muscle

A

Thoracolumbar fascia, iliac crest, inguinal ligament and costal cartilages of lower 6 ribs

42
Q

Insertion of transversalis abdominus muscle

A

Linea alba, Pubic crest, Pectineal line.

43
Q

Innervation of transversalis abdominus muscle

A

Thoracoabdominal nerves (T7-T11 anterior rami) and Subcostal nerve.

44
Q

Action of transversalis abdominus muscle

A

Compresses abdominal contents

45
Q

Origin of rectus abdominus muscle

A

Pubic crest and Pubic symphysis

46
Q

Insertion of rectus abdominus muscle

A

Costal cartilages of Rib 5-7, and xiphoid process

47
Q

Innervation of rectus abdominus muscle

A

Thoracoabdominal nerves (T7-T11 anterior rami) and Subcostal nerve.

48
Q

Action of rectus abdominus muscle

A

Compresses abdominal contents, flexes vertebral column and tenses abdominal wall.

49
Q

Origin of pyramidalis muscle

A

Pubis and Pubic symphysis.

50
Q

Insertion of pyramidalis muscle

A

Linea alba

51
Q

Innervation of pyramidalis muscle

A

Subcostal nerve

MSK (10 decks)

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