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Flashcards in Muscles List Deck (154)
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1

Trapezius

O:Medial third of superior nuchal line, external occipital protuberance, nuchal ligamemt,spinous process of C7-T12

I:lateral third of clavicle,acromion, spine of scapula,

A: upper trap (descending) elevates the scapula, lower (ascending) trap depresses the scapula, middle trap retracts the scapula, the descending and ascending traps act to rotate glenoid cavity superiorly

In: spinal accesory nerve Cranial Nerve XI motor fibers, C3/C4 spinal nerves, pain and proprioceptive fibers

2

Latissimus Dorsi

O: spinous processes of T7-T12, thoracolumbar fascia, iliac crest, inferior 3 or 4 ribs

I: floor of intertubercular sulcus of humerus

A: extends, adducts, medially rotates humerus, raises body toward arm while climbing

In: thoracodorsal nerve C6, C7, C8

3

Rhomboid Major

O: spinous proceses of T2-T5

I: medial border of the scapula from level of spine to inferior angle

A: retract the scapula, rotate it to depress the glenoid cavity, fixes scapula to thoracic wall

In: dorasal scapular nerve C4, C5

4

Rhomboid Minor

O: nucal ligament, spinous processes of C7 and T1 vertebrae

I: smooth triangular area at medial end of the scapular spine

A: retract the scapula, rotate it to depress the glendoid cavity, fixes scapula to thoracic wall

IN: dorsal scapular nerve C4, C5

5

Levator Scapulae

O: posterior of tubercles of transverse processes of C1-C4 vertebrae

I: medial border of the scapula, superior to the root of the spine

A: elevate the scapula and rotate the glenoid cavity inferiorly by rotating scapula

IN: dorsal scapular nerve C5; cervical nerves C4,C5

6

Serratus Posterior Superior

O: nuchal ligament; spinous processes of C7-T3 vertebrae

I: superior borders of the 2nd-4th ribs

A: elevate ribs

IN: 2nd-5th intercostal nerves

7

Serratus Posterior Inferior

O: spinous process of T11-L2

I: inferior borders of 8th-12th ribs near their angles

A: depress ribs

IN: anterior rami of T9-T12 thoracic spinal nerves

8

Splenius Capitis

O: nuchal ligament and spinous processes of C7-T3/T4 vertebrae

I: fibers run superolaterally to mastoid process of temporal bone and lateral third of superior nuchal line of occipital bone

A: acting unilaterally: laterally flex neck and rotate head ipsilaterally
Acting bilaterally: extend head and neck

IN: posterior rami of spinal nerve

9

Splenius Cervicis

O: nuchal ligament and spinous processes of C7-T6 vertebrae

I: tubercles of transverse processes of C1-C3 vertebrae

A: acting unilaterally: laterally flex neck and rotate head ipsilaterally
Acting bilaterally: extend head and neck

IN: posterior rami of spinal nerves

10

Iliocostalis

O: arises by a broad tendon from the posterior part of iliac crest; posterior surface of sacrum; sacroiliac ligaments; sacral and inferior lumbar spinous processes; supraspinous ligament

I: lumborum, thoracis, cervicis; fibers run superiorly to angles of the lower ribs and cervical transverse processes

A: acting bilaterally: extend the vertebral column and head; as back is flexed control movement via eccentric contraction;
acting unilaterally: laterally flex vertebral column

IN: posterior rami of spinal nerves

11

Longissimus

O: arises by a broad tendon from posterior part of iliac crest, posterior surface of sacrum, posterior surface of sacroiliac ligaments, sacral and inferior lumbar spinous processes, and supraspinous ligament

I: thoracis, cervicis, capitis; fibers run superiorly to ribs between tubercles and angles of transverse processes in the thoracic and cervical regions, and to mastoid process of temporal bone

A: acting bilaterally: extend the vertebral column and head; as back is flexed control movement via eccentric contraction;
acting unilaterally: laterally flex vertebral column

IN:posterior rami of spinal nerves

12

Spinalis

O:arises by a broad tendon from posterior part of iliac crest, posterior surface of sacrum, posterior surface of sacroiliac ligaments, sacral and inferior lumbar spinous processes, and supraspinous ligament

I: thoracis, cervicis, capitis, fibers run superiorly to the spinous processes in the upper thoracic region and to cranium

A: acting bilaterally: extend the vertebral column and head; as back is flexed control movement via eccentric contraction;
acting unilaterally: laterally flex vertebral column

IN: posterior rami of spinal nerves

13

Obliquus Capitis Superior

O: transverse processes of C1 vertebrae

I: occipital bone between the superior and inferior nuchal lines

A: lateral flexion and extension of the head and heck

IN: suboccipital nerve

14

Obliquus Capitis Inferior

O: spinous processes of C2

I: transverse processes of C1

A: rotate the head ipsilaterally

IN: suboccipital nerve

15

Rectus Capitis Posterior Major

O: spinous process of C2 vertebrae

I: lateral part of the inferior nuchal line of the occipital bone

A: acting unilaterally: rotate the head ipsilaterally
acting bilaterally: extend the head and neck

IN: suboccipital nerve

16

Rectus Capitis Posterior Minor

O: posterior tubercles of the posterior arch of C1 vertebrae

I: medial part of the inferior nuchal line of the occipital bone

A: acting unilaterally: rotate the head ipsilaterally
acting bilaterally: extend the head and neck

IN: suboccipital nerve

17

Supraspinatus

O: supraspinous fossa of the scapula

I: superior facet of the greater tubercle of the humerus

A: initiates and assists the deltoid in abduction of the arm and acts with the rotator cuff muscles

IN: suprascapular nerve C4, C5, C6

18

Infraspinatus

O: infraspinous fossa of the scapula

I: middle facet of the greater tubercle of the humerus

A: externally rotate the arm; acts with the other rotator cuff muscles; helps to hold the humeral head in the glenoid cavity

IN: suprascapular nerve C5, C6

19

Teres Minor

O: middle part of the lateral border of the scapula

I: inferior facet of the greater tubercle of the humerus

A: externally rotate the arm; acts with other rotator muscles; helps to hold humeral head in place

IN: axillary nerve C5, C6

20

Teres Major

O: posterior surface of inferior angle of scapula

I: medial lip of interbercular groove of the humerus

A: adducts and medially rotates arm

IN: lower subscapular nerve C5, C6

21

Subscapularis

O: subscapular fossa (most of the anterior surface of scapula)

I: lesser tubercle of the humerus

A: medially rotates and adducts the arms; helps to hold the humeral head in glenoid cavity

IN: upper and lower subscapular nerves C5, C6, C7

22

Semispinalis

O: Arises from transverse processes of C4-T12 vertebrae

I: Thoracis, Cervicis, Capitus: fibers run superomedially to occipital bone and spinous processes in thoracic and cervical regions, spanning 4-6 segments

A:Extends head, thoracic and cervical regions of vertebral column and rotates them contralaterally

IN: posterior rami of spinal nerves

23

Multifidus

O: Arises from posterior sacrum; posterior superior iliac spine of ilium; aponeurosis of erector spinae; sacroiliac ligaments; mammillary processes of lumbar vertebrae; transverse processes of T1-T3; articular processes of C4-C7

I: Thickest in lumbar region; fibers pass obliquely superomedially to entire length of spinous processes, spanning 2-4 segments superior to the origin

A: Stabilizes vertebrae during local movements of the vertebral column

IN: posterior rami of spinal nerves

24

Rotatores (brevis and longus)

O: Arise from transverse processes of vertebrae; best developed in thoracic region

I: Fibers pass superomedially to attach to the junction of the lamina and transverse process or spinous process of vertebra immediately (brevis) or 2 segments (longus) superior to vertebra of attachment

A: Stabilize vertebrae and assist with local extension and rotatory movements of vertebral column; may function as organs of proprioception

IN: posterior rami of spinal nerves

25

Deltoids

O: lateral third of the clavicle; acromion and spine of the scapula

I: deltoid tuberosity of the humerus

A: anterior part: flexes and medially rotates arm
middle part: abducts arm
posterior part: extends and externally rotates arm

IN: axillary nerve C5, C6

26

Triceps Brachii

O: long head: infraglenoid tubercle of scapula
lateral head: posterior surface of the humerus, superior to the radial groove
medial head: posterior surface of the humerus, inferior to the radial groove

I: proximal end of the olecranon of the ulna and the fascia of the forearm

A: extends the forearm; long head resists dislocation of the humerus (important during abduction)

IN: radial nerve C6, C7, C8

27

Anconeus

O: lateral epicondyle of humerus

I: lateral surface of olecranon and superior part of posterior surface of ulna

A: assists triceps in extending forearm; stabilize elbow join; abduct ulna during pronation

IN: radial nerve C7, C8, T1

28

Pectoralis Major

O: clavicular head; anterior surface of the medial half of the clavicle; Sternocostal head: anterior surface of the sternum; superior 6 costal cartilages; abdominal head: aponeurosis of the external oblique

I: lateral lip of the intertubercular sulcus of the humerus

A: horizontally adducts and medially rotates the humerus; draws the scapula anteriorly and inferiorly. Acting alone, the clavicular head flexes the humerus and the sternocostal extends it from the felxed position

IN: Lateral and medial pectoral nerves; clavicular head (C5, C6), sternocostal head (C7, C8, T1)

29

Pectoralis Minor

O: 3rd to 5th ribs near their costal cartilage

I: medial border and the superior surface of the coracoid process of the scapula

A: stabilizes the scapula by drawing it inferiorly and anteriorly against the thoracic wall (thus tipping the inferior angle of the scapula)

IN: medial pectoral nerve (C8, T1)

30

Subclavius

O: junction of the 1st rib and its costal cartilage

I: inferior surface of the middle third of the clavicle

A: anchors and depresses the clavicle

IN: nerve to subclavius C5, C6