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Trunk Muscles > Back Muscles > Flashcards

Back Muscles Flashcards

1
Q

Trapezius

A

Origin:
Occipital bone, Ligamentum nuchae, Spinous processes of C7-T12

Insertion:
Lateral third of clavicle, Acromion & Spine of scapula

Function:
Elevates, retracts & rotates scapula

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2
Q

Latissimus Dorsi

A

Origin:
Spinous processes of T7-T12, Thoracolumbar fascia, Iliac crest, Inferior 3-4 ribs

Insertion:
Floor of intertubercular sulcus of humerus

Function:
Extends, Adducts & Medially rotates humerus

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3
Q

Rhomboids (Major and Minor)

A

Origin:
Spinous processes of C7-T5

Insertion:
Medial border of scapula

Function:
Retracts & rotates scapula

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4
Q

Levator Scapulae

A

Origin:
Transverse processes of C1-C4

Insertion:
Medial border of scapula

Function:
Elevates scapula

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5
Q

Supraspinatus

A

Origin:
Supraspinatus fossa of scapula

Insertion:
Greater tubercle of humerus

Function:
Abducts arm

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6
Q

Infraspinatus

A

Origin:
Infraspinous fossa of scapula

Insertion:
Greater tubercle of humerus

Function:
Laterally rotates arm

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7
Q

Teres Major

A

Origin:
Inferior angle of scapula

Insertion:
Crest of lesser tubercle on anterior humerus

Function:
Extends, adducts & medially rotates arm

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8
Q

Teres Minor

A

Origin:
Lateral border of scapula

Insertion:
Greater tubercle of humerus

Function:
Laterally rotates arm

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9
Q

Subscapularis

A

Origin:
Subscapular fossa of scapula

Insertion:
Lesser tubercle of humerus

Function:
Medially rotates arm

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10
Q

Erector Spinae (Iliocostalis, Longissimus, Spinalis)

A

Origin:
Broad tendon attached to lateral part of sacrum, Iliac crest, Spinous processes of lumbar & The last two thoracic vertebrae

Insertion:
Ribs and transverse & Spinous processes of vertebrae

Function:
Extend vertebral column & head, rotate them to the opposite side

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11
Q

Quadratus Lumborum

A

Origin:
Iliac crest & Iliolumbar ligament

Insertion:
12th rib, transverse processes of L1-L4 vertebrae

Function:
Lateral flexion of vertebral column, Helps in the extension of vertebral column

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12
Q

Origin:
Occipital bone, Ligamentum nuchae, Spinous processes of C7-T12

Insertion:
Lateral third of clavicle, Acromion & Spine of scapula

Function:
Elevates, retracts & rotates scapula

A

Trapezius

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13
Q

Origin:
Spinous processes of T7-T12, Thoracolumbar fascia, Iliac crest, Inferior 3-4 ribs

Insertion:
Floor of intertubercular sulcus of humerus

Function:
Extends, Adducts & Medially rotates humerus

A

Latissimus Dorsi

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14
Q

Origin:
Spinous processes of C7-T5

Insertion:
Medial border of scapula

Function:
Retracts & rotates scapula

A

Rhomboids (Major and Minor)

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15
Q

Origin:
Transverse processes of C1-C4

Insertion:
Medial border of scapula

Function:
Elevates scapula

A

Levator Scapulae

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16
Q

Origin:
Supraspinatus fossa of scapula

Insertion:
Greater tubercle of humerus

Function:
Abducts arm

A

Supraspinatus

17
Q

Origin:
Infraspinous fossa of scapula

Insertion:
Greater tubercle of humerus

Function:
Laterally rotates arm

A

Infraspinatus

18
Q

Origin:
Inferior angle of scapula

Insertion:
Crest of lesser tubercle on anterior humerus

Function:
Extends, adducts & medially rotates arm

A

Teres Major

19
Q

Origin:
Lateral border of scapula

Insertion:
Greater tubercle of humerus

Function:
Laterally rotates arm

A

Teres Minor

20
Q

Origin:
Subscapular fossa of scapula

Insertion:
Lesser tubercle of humerus

Function:
Medially rotates arm

A

Subscapularis

21
Q

Origin:
Broad tendon attached to lateral part of sacrum, Iliac crest, Spinous processes of lumbar & The last two thoracic vertebrae

Insertion:
Ribs and transverse & Spinous processes of vertebrae

Function:
Extend vertebral column & head, rotate them to the opposite side

A

Erector Spinae (Iliocostalis, Longissimus, Spinalis)

22
Q

Origin:
Iliac crest & Iliolumbar ligament

Insertion:
12th rib, transverse processes of L1-L4 vertebrae

Function:
Lateral flexion of vertebral column, Helps in the extension of vertebral column

A

Quadratus Lumborum

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