Muscles of the upper limb

MIND MAP - OUTLINE of muscles of upper extremity

POSTERIOR AND ANTERIOR VIEW of the muscles of upper extremity

Muscles connecting upper limb to thoracic wall

1. Pectoralis Major
origin- sternum, clavical and upper six costal cartilages
insertion- lateral lip of bicipital groove of humerus
nerve supply- lateral and medial pectoral nerves from brachial plexus.

2. pectoralis minor
origin- 3rd, 4th, 5th ribs
insertion- coracoid process of scapula

nerve supply- medial pectoral nerve from brachial plexus.

3. Subscapularis
origin- 1st costal cartilage
insertion- clavicle
nerve supply- nerve to subscapularis from the upper trunk of brachial plexus.

4. Serratus anterior
Origin- upper 8 ribs
Insertion- medial border and inferior bordrer if scapula
Nerve supply- long thoracic nerve

Muscles connecting upper limb tovertebral column
1. Trapezius-
Origin- Occipital bone, ligamentum nuchae, spine of 7th cervical vertebrae, spines of all thoracic vertebrae
Insertion- upper fibers in to lateral 3rd of clavicle, middle & lower fibers into acromion and spine of scapula
Nerve supply- spinal part of accessory nerve and C3 and C4

2. Latissumus dorsi
Origin- iliac crest, lumber fascia, spines of lower thoracic vertebrae, lower 3 or 4 ribs, and inferior angle of scapula
Insertion- floor of bicipital groove of humerus
Nerve supply- thoraco dorsal nerve

3. Lavator scapulae
Origin- transverse processes of 1st four cervical vertebrae
Insertion- medial border of scapula
Nerve supply- 3 and 4 and dorsal scapular nerve

Rhomboid minor
Origin- ligamentum nuchae, and spines of 7thcervical anf first thoracic vertebrae
Insertion- medial border of scapula
Nerve supply- dorsal scapular nerve

Rhomboid major

Origin- 2nd to fifth thoracic vertebrae

Insertion- medial border of scapula

Nerve supply- Dorsal scapular nerve