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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
Origin of quadratus lamborum
Transverse process of L5, Iliac Crest, Iliolumbar process
26
Insertion of quadratus lamborum
Transverse processes of L1-L4, Inferior border of rib 12
27
Innervation of quadratus lamborum
Anterior rami of T12, L1-L4.
28
Action of quadratus lamborum
Depresses and stabilizes Rib 12, lateral bending of trunk, both muscles together extend trunk
29
Origin of iliacus muscle
Iliac fossa.
30
Insertion of iliacus muscle
Joins with Psoas major to insert on lesser trochanter of Femur
31
Innervation of iliacus muscle
Femoral nerve.
32
Action of iliacus muscle
Flexes thigh at hip joint and flexes trunk when supine
33
Origin of external oblique
Lower six rib shafts (T7-T12).
34
Insertion of external oblique
Linea alba, pubic tubercle.
35
Innervation of external oblique
Thoracoabdominal nerves (T7-T11 anterior rami).
36
Action of external oblique
Flexion of torso
37
Origin of internal oblique
Inguinal ligament, iliac crest.
38
Insertion of internal oblique
Linea alba, Ribs 10-12.
39
Innervation of internal oblique
Thoracoabdominal nerves (T7-T11 anterior rami) and Subcostal nerve.
40
Action of internal oblique
Flexion of trunk
41
Origin of transversalis abdominus muscle
Thoracolumbar fascia, iliac crest, inguinal ligament and costal cartilages of lower 6 ribs
42
Insertion of transversalis abdominus muscle
Linea alba, Pubic crest, Pectineal line.
43
Innervation of transversalis abdominus muscle
Thoracoabdominal nerves (T7-T11 anterior rami) and Subcostal nerve.
44
Action of transversalis abdominus muscle
Compresses abdominal contents
45
Origin of rectus abdominus muscle
Pubic crest and Pubic symphysis
46
Insertion of rectus abdominus muscle
Costal cartilages of Rib 5-7, and xiphoid process
47
Innervation of rectus abdominus muscle
Thoracoabdominal nerves (T7-T11 anterior rami) and Subcostal nerve.
48
Action of rectus abdominus muscle
Compresses abdominal contents, flexes vertebral column and tenses abdominal wall.
49
Origin of pyramidalis muscle
Pubis and Pubic symphysis.
50
Insertion of pyramidalis muscle
Linea alba
51
Innervation of pyramidalis muscle
Subcostal nerve

MSK (10 decks)

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