Anterior chest, arm and review muscles Flashcards Preview

Gross Anatomy: Unit Two. > Anterior chest, arm and review muscles > Flashcards

Flashcards in Anterior chest, arm and review muscles Deck (66):
1

supraspinous origin

suprascapular fossa of the scapula

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supraspinous insertion

superior facet of the greater tubercle of the humerus

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supraspinatus innervation

suprascapular nerve (C4, C5, C6)

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supraspinatus action

initates and assits the deltoid with abduction of the shoulder, acts with other rotator cuff muscles

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infraspinatus origin

infrascapular fossa of the scapula

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infraspinatus insertion

middle facet of the greater tubercle of the humerus

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infraspinatus innervation

suprascapular nerve (C4,C5, C6)

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infraspinatus action

laterally rotate the shoulder joint, helps hold the humeral head in cavity

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trapezuis origin and insertion

origin: nuchal ligament, spinous processes of C7-T12, Medial 3rd of Superior Nuchal line, External Occipital Proturbernce
insertion: Acromin and Spine of the Scapula and the lateral clavicle

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trapezuis innervation and action

innervation: spinal accessory nerve (CN XI)
Action:
Decending fibers: elevates scapula
Midde Fibers: depresses scapula
Ascending fibers: retract scapula

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Rhomboid Major and Minor origin

Major: Spinous processes of T2-T5
Minor: Nuchal ligament, Spinous processes of C7-T1

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Rhomboid Major and Minor insertion

Minor: at the root of the spine of the scapula on the medial border
Major: below the spine of the scapula on the medial border (to the inferior angle)

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Rhomboid Major and Minor innervation and action

Major and Minor: Dorsal-scapular Nerve (C5)

retracts the scapula

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Levator Scapulae Origin

posterior tubercles of transverse processes of C1-C4

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Levator Scapulae insertion

attaches above the spine of the scapula on the medial border

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Levator Scapulae innervation and action

Dorsal-scapular nerve

elevates scapula

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Subscapularis origin

on the subscapular fossa on the anterior scapula

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subscapularis insertion

lesser tubercle of the humerus

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subscapularis innervation

Upper and Lower Subscapular Nerves (C5,C6,C7)

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teres minor origin

middle part of the lateral border of the scapula

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teres minor insertion

inferior facet of the greater tubercle of the humerus

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teres minor innervation

Axillary Nerve (C5, C6)

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teres minor action

laterally rotate the shoulder joint, and help to hold the humeral head in the cavity

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teres major origin

inferior lateral border of the scapula and posterior surface of the inferior border of the scapula

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teres major insertion

medial lip of the intertubercular sucus of the humerus

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teres major innveration

lower subscapular nerve (C5, C6)

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teres major action

adduct and medially rotates the shoulder joint

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Deltoid origin

lateral 3rd of the clavicle
Acromion and spine of the scapula

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Deltoid insertion

Deltoid tuberosity of the humerus

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Deltoid innervation

Axillary Nerve (C5, C6)

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Deltoid Action

Anterior: flexes and medially rotates the shoulder joint
Middle: abducts shoulder joint
Posterior: extends and laterally rotates shoulder joint

when they all work the arm get lifted all the way up

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Subclavius origin

Junction of the 1st rib and the costal cartilage

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Subclavius insertion

Anterior surface of the medial border of the scapula

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Subclavius innervation

Subclavin nerve (C5,C6)

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Subclavius action

Anchors the depresses the clavicle

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Latissimus Dorsi origin

Spinous process of inferior 6 thoracic
Thoracolumbar fascia
Iliac crest
Inferior 3-4 ribs

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Latissimus Dorsi insertion

Inter tubercular sucus of the humerus

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Latissimus dorsi innervation

Thoracodorsal nerve (C5,6,7)

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Latissimus Dorsi action

Extends, adducts, and medially rotates the shoulder

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Pectoralis Major Origin

two heads:
clavicular head: anterior surface for the medial half of the clavicle
sternocostal head: anterior septum, superior 6 costal cartilages and the aponeurosis of external oblique muscle

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Pectoralis Major Insertion

lateral lip of the intertubercule sucus of the humerus

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Pectoralis Major innervation

Lateral and Medial Pectoral Nerves
Clavicular head: C5, C6
Sterno-head: C7,C8,T1

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Pectoralis Major action

adducts and medially rotates the shoulder joint
draws the scapula anteriorly and inferiorly
*When it acts alone the clavicular head flexes and the sterno head extends from a flexed position

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Pectoralis Minor origin

3rd and 5th ribs near the costal cartilages

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Pectoralis Minor insertion

Medial and Superior Surface of the Coracoid Porcess of Scapula

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Pectoralis Minor innervation

Medial Pectoral Nerve (C8,T1)

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Pectoralis Minor action

Stablizes the scapula by drawing it against the thoracic wall

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Serratus Anterior origin

external surface of the lateral parts of the 1st and 8th ribs

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Serratus Anterior insertion

anterior surface of the medial border of the scapula

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Serratus Anterior innervation

long thoracic nerve (C5, C6, C7)

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Serratus Anterior action

Protracts the scapula
Hold the scapula to the thoracic wall
Rotates the scapula

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Sternocleidomastoid origin

Mastoid process of he temporal bone
Superior nuchal line

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Sternocleidomastoid insertion

There is a sterno head and a clavicular head

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Sternocleidomastoid innervation

spinal accessory nerve (CN XI)

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Sternocleidomastoid action

Unilateral: tilts the head the same side and rotates face superiorly towards opposite side

Bilaterally: extends the neck to AO joint, flexes head to the sternum

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Scalene posterior origin

Posterior tubercles of the transverse processes of C4-C6

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Scalenes posterior insertion

2nd rib

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Scalenes posterior innervation

Anterior rami of c7 and c8

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All the scalenes motion

Lateral flex the neck, and elevates the rib they attach to

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Scalenes middle origin

Posterior tubercles of the transverse processes of c4-7

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Scalenes middle insertion

First rib

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Scalenes middle innervation

Anterior rami

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Scalenes anterior origin

Anterior tubercles of C3-6

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Scalenes anterior insertion.

First rib

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Scalenes anterior innervation

Cervical spinal nerves of c4-6

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Subscapularis action

Medial rotates the shoulder
Adducts the shoulder