Muscle Anatomy: Muscle Walls of Trunk Flashcards

1
Q

What are oblique and rectus muscles

A

Oblique muscles lie at an angle to the body axis

Rectus muscles lie parallel to the body axis

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2
Q

What muscles are the oblique group made up of?

A

Thoracic region, abdominal region and transversus abdominis

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3
Q

What muscles make up the thoracic region?

A

External intercostals and internal intercostals

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4
Q

Where do external intercostals originate?

A

Inferior border of each rib

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5
Q

Where is the insertion of external intercostals?

A

Superior border of more inferior rib

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6
Q

What action do the external intercostals do?

A

Elevate ribs

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7
Q

Where do the internal intercostals originate?

A

Superior border of each rib

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8
Q

Where is the insertion of the internal intercostals?

A

Inferior border of the adjacent superior rib

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9
Q

What action does the internal intercostals do?

A

Depress ribs

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10
Q

What muscles make up the abdominal region?

A

External oblique and internal oblique

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11
Q

Where does the external oblique originate?

A

External and inferior borders of ribs 5-12

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12
Q

Where is the insertion of the external oblique?

A

Linea alba and iliac crest

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13
Q

What action does the external oblique perform?

A

Compresses abdomen; depress ribs, flex or bend vertebral column

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14
Q

Where does the internal oblique originate?

A

Lumbodorsal fascia and iliac crest

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15
Q

Where is the insertion of the internal onlique?

A

Inferior ribs, xi[hoid process and linea alba

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16
Q

What action does the internal oblique perform?

A

Compress abdomen, depress ribs, flex or bend vertebral column

17
Q

Where does the transversus abdominis originate?

A

Cartilages of ribs 6-12, iliac crest, and lumbodorsal fascia

18
Q

Where is the insertion of the transversus abdominis?

A

Linea alba and pubis

19
Q

What action does the transversus abdominis perform?

A

Compress abdomen

20
Q

What is the linea alba?

A

Tendinous band that runs along the anterior midline

21
Q

What is the muscle that is an example of a rectus muscle?

A

Rectus abdominis

22
Q

Where does the rectus abdominis originate?

A

Superior surface of the oubis near the symphysis

23
Q

Where is the insertion of the rectus abdominis?

A

Inferior surfaces of costal cartilages (ribs 5-7) and xiphoid process

24
Q

What action does the rectus abdominis perform?

A

Depress ribs, flex vertebral column, compress abdomen