Muscles (Back, Upper Limb) Flashcards by Gavin Fox

Origin of Trapezius

Superior nuchal line, external occipital protuberance, ligamentum nuchae, and spinous processes of C7 through T12

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Insertion of Trapezius

Lateral 3rd of clavicle, acromion and spine of scapula

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Innervation of Trapezius

Suptrapezial nerve plexus, Motor: Accessory n. (CN XI) and Proprioception: Cervical nn. (C3 and C4)

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Actions of Trapezius

Elevates, retracts and rotates scapula

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Blood Supply to Trapezius

Branch(es) of the transverse cervical artery

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Origin of Latissimus Dorsi

Spinous processes of T6 through T12, Thoracolumbar Fascia, iliac crest, and ribs X to XII

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Insertion of Latissimus Dorsi

Floor of the intertubercular groove of the humerus

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Actions of Latissimus Dorsi

Extends, adducts and medially rotates the humerus; raise body during climbing

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Innervation of Latissimus Dorsi

Thoracodorsal n. (C6,C7,C8)

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Blood Supply to Latissimus Dorsi

Thoracodorsal artery from the subscapular a.

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Origin of Levator Scapulae

Posterior tubercles of the transverse processes of C1 through C4

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Insertion of Levator Scapulae

Upper portion of the medial border of the scapula

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Innervation of Levator Scapulae

Cervical nerves C3 and C4 and Dorsal Scapular n. (C5)

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Actions of Levator Scapulae

Elevates the scapula and tilts the glenoid cavity inferiorly by rotating the scapula

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Blood Supply to Levator Scapulae

Dorsal scapular a.

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Origin of Rhomboideus Major

Spinous processes of T2-T5

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Origin of Rhomboideus Minor

Spinous processes of C7-T1 and ligamentum nuchae

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Insertions of Rhomboideus Major and Minor

Medial border of the scapula from above scapular spine to the inferior angle. Minor is superior to the major.

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Innervation of Rhomboideus Major and Minor

Dorsal Scapular n. (C4, C5)

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Actions of Rhomboideus Major and Minor

Retracts scapula and elevates it. Rotation depresses the glenoid cavity. Fixes scapula to thoracic wall.

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Blood supply to Rhomboideus Major and Minor

Dorsal scapular a.

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Three columns of Erector Spinae

Lateral to medial: Iliocostalis, Logissimus, Spinalis

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Origin of Erector Spinae group

Sacrum and spinous processes of lumbar and lower thoracic vertebrae

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Insertion of Iliocostalis

The angles of the ribs

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Insertion of Longissimus

The transverse processes of vertebrae at all levels up to the base of the skull

The Spinalis fibers...?

interconnect the spinous processes of adjacent vertebrae

Innervation of Erector Spinae group

Innervated segmentally by the Dorsal Primary Rami of spinal nerves

The Dorsal Scapular muscles

Supraspinatus, Intraspinatus, Teres Major and Teres Minor

Origin of Subscapularis

Subscapular fossa

Insertion of Subscapularis

Lesser tubercle of the humerus

Innervation of Subscapularis

Upper and Lower Subscapular nn.

Action of Subscapularis

Medial rotation of the arm

Origin of Supraspinatus

Supraspinous fossa

Insertion of Supraspinatus

Greater tubercle of the humerus (superior facet)

Innervation of Supraspinatus

Suprascapular n. (C5, C6)

Action of Supraspinatus

Abduction (0-15 degrees)

Origin of Infraspinatus

Infraspinous fossa

Insertion of Infraspinatus

Greater tubercle of the humerus (middle facet)

Innervation of Infraspinatus

Suprascapular n. (C5,C6)

Action of Infraspinatus

Lateral Rotation of the arm

Origin of Teres Minor

Upper lateral border of the scapula

Insertion of Teres Minor

Greater tubercle of the humerus (inferior facet)

Innervation of Teres Minor

Axillary n. (C5, C6)

Action of Teres Minor

Lateral rotation of the arm

Origin of Teres Major

Lower lateral border of the scapula

Insertion of Teres Major

Crest of the lesser tubercle of the humerus

Innervation of Teres Major

Lower subscapular n.

Action of Teres Major

Medial rotation, adduction and extension of the arm

Origin of Deltoid

Lateral margin of the scapular spine, acromion and clavicle

Insertion of Deltoid

Deltoid tuberosity of the humerus

Innervation of Deltoid

Axillary n. (C5, C6)

Action of Deltoid

Adduction (15-100 degrees) Anterior fibers: Medial rotation and flexion of the arm Posterior fibers: Lateral rotation and extension of the arm

Origin of Pectoralis Major

Clavicle, sternum and ribs 1-6

Insertion of Pectoralis Major

Crest of the greater tubercle of the humerus

Innervation of Pectoralis Major

Medial and lateral pectoral nn.

Action of Pectoralis Major

Medial rotation, adduction and flexion of the arm

Origin of Pectoralis Minor

Ribs 3-5

Insertion of Pectoralis Minor

Coracoid process of the scapula

Innervation of Pectoralis Minor

Medial pectoral n.

Action of Pectoralis Minor

Protraction of the scapula

Origin of Serratus Anterior

Ribs 1-9

Insertion of Serratus Anterior

Medial border of the scapula, costal surface

Innervation of Serratus Anterior

Long thoracic n. (C5-C7)

Action of Serratus Anterior

Protraction and superior rotation of the lateral angle of the scapula; holds scapula against the dorsal trunk

Origin of Subclavius

1st Rib

Insertion of Subclavius

Groove on the middle 1/3 of the clavicle

Innervation of Subclavius

N. to the subclavius

Action of Subclavius

Pulls tip of the shoulder down, pulls clavicle medially to stabilize the sternoclavicular joint, serves to cushion neurovascular structures deep to the clavicle

Elevation of scapula

Upper trapezius, levator scapulae

Protraction of scapula

Serratus anterior, pectoralis minor

Superior rotation of lateral angle of scapula

Upper and lower trapezius, serratus anterior

Depression of scapula

Lower trapezius, Lower serratus anterior, gravity

Retraction of scapula

Rhomboid major, rhomboid minor, middle trapezius

Inferior rotation of lateral angle of scapula

Levator scapulae, rhomboid minor, rhomboid major, gravity

Flexion of arm

Pec major, anterior deltoid, biceps brachii, coracobrachialis

Abduction of arm

Supraspinatus, deltoid

Medial rotation of arm

Subscapularis, teres major, latissimus dorsi, anterior deltoid, pectoralis major

Extension of arm

Latissimus dorsi, teres major, posterior deltoid, long head of triceps brachii

Adduction of arm

Anterior and posterior deltoid, latissimus dorsi, teres major, pectoralis major

Lateral rotation of arm

Infraspinatus, teres minor, posterior deltoid

Muscles (Back, Upper Limb) Flashcards

(80 cards)