Cadaver back muscles Diagram

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Last updated 4:44 AM on 9/10/26
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23 Terms

1
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External intercostals

Elevate ribs / Expand lungs

O: Inferior margins of ribs

I: Superior margins of ribs

2
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Internal intercostals

Depress ribs / Compress lungs

O: Superior margins of ribs

I: Inferior margins of ribs

3
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Teres major

Extend & medially rotate humerus

O: Scapula - inferior angle

I: Humerus - intertubercular sulcus

4
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Teres minor

Laterally rotate humerus

O: Scapula - lateral border

I: Humerus - greater tubercle

5
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Deltoid

Flex, abduct, extend humerus

O: Acromion & spine of scapula & clavicle

I: Deltoid tuberosity of humerus

6
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Latissimus dorsi (cut)

Extend, abduct, medially rotate humerus

O: Vertebrae, ribs, ilium

7
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Erector spinae spinalis

Extend vertebral column

8
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Erector spinae longissimus

Extend vertebral column

9
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Erector spinae iliocostalis

Extend vertebral column

10
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External abdominal oblique

Compress/support abdomen

Rotation of waist

O: Ribs

I: Iliac crest & pubis

11
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Quadratus lumborum

Extend & laterally flex lumbar vertebrae

O: Iliac crest

I: Rib 12 & vertebrae

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Infraspinatus

Laterally rotate humerus

O: Scapula - infraspinous fossa

I: Humerus - greater tubercle

13
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Supraspinatus

Abduct humerus

O: Scapula - supraspinous fossa

I: Humerus - greater tubercle

14
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Gluteus maximus

Extend & abduct hip

O: Pelvis

I: Femur - gluteal tuberosity

15
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Semispinalis capitis

Rotate & extend neck

16
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Splenius capitis

Rotate, laterally flex, & extend neck

<p>Rotate, laterally flex, & extend neck</p>
17
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Longissimus capitis

Rotate, laterally flex, & extend neck

<p>Rotate, laterally flex, & extend neck</p>
18
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Scalenes

Rotate & flex neck

Flex & elevate ribs

<p>Rotate & flex neck</p><p>Flex & elevate ribs</p>
19
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Sternocleidomastoid

Tilt head up/to the side

Flex neck & elevate ribs

O: Sternum & clavicle

I: Temporal - mastoid process

<p>Tilt head up/to the side</p><p>Flex neck & elevate ribs</p><p>O: Sternum & clavicle</p><p>I: Temporal - mastoid process</p>
20
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Levator scapulae

Elevate scapula & shoulder

O: Vertebrae C1 - C4

I: Scapula - Medial border & superior angle

<p>Elevate scapula & shoulder</p><p>O: Vertebrae C1 - C4</p><p>I: Scapula - Medial border & superior angle</p>
21
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Rhomboid minor

Elevate scapula & shoulder

Adduct scapula & retract shoulder

O: Vertebrae - C7-T1

I: Scapula - medial border

<p>Elevate scapula & shoulder</p><p>Adduct scapula & retract shoulder</p><p>O: Vertebrae - C7-T1</p><p>I: Scapula - medial border</p>
22
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Rhomboid major

Elevate scapula & shoulder

Adduct scapula & retract shoulder

O: Vertebrae - T2-T5

I: Scapula - medial border

23
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Trapezius

Elevate or depress scapula & shoulder

Adduct scapula & retract shoulder

O: Occipital & vertebrae

I: Acromion & spine of scapula, clavicle

<p>Elevate or depress scapula & shoulder</p><p>Adduct scapula & retract shoulder</p><p>O: Occipital & vertebrae</p><p>I: Acromion & spine of scapula, clavicle</p>