Lecture notes
Muscles insertion & origin-first year Med student
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This document summarize the Muscle insertion, origin, and nerve supply.
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Pectoral region Mammary glandMuscle Origin: Insertion Nerve Action
supply
Pectoralis major Clavicular head : medial lateral lip of Medial & Medial rotation
half of anterior Intertubercular sulcus lateral adduction at
surface of clavicle pectoral shoulder joint
nerves
Sternocostal head :
Anterior surface of
sternum up to 6th
costal cartilage & 2nd to
6th
costal cartilage
Pectoralis minor 3rd to 5th coracoid process of medial & Protracts the
Ribs (NOT THE COSTAL scapula lateral scapula
CARTILAGE) pectoral
nerves
Subclavius First rib & its costal groove on the upper steadies clavicle
cartilage undersurface of trunk of during
middle third of brachial movements of
clavicle plexus shoulder joint
Serratus anterior 8 digitations outer All digitations pass Long Protracts the
surface of outer 8 ribs around the chest thoracic scapula along th
wall & reach the costal nerve chest wall
surface of scapula,insert (Nerve of
in pushing &
on costal surface Medial bell)
punching
border (anterior surface
movement
of medial border)
, Winging of scapula : Caused by paralys
of
serratus anterior muscle
Muscles of the back & Scapular region
Muscle Origin Insertion Nerve supply Action
Trapezius (Back) • medial part of • posterior spinal part of Elevate & Retract the
superior border lateral accessory scapula
nuchal line third nerve
• Ligamentum of clavicle
nuchae • medial
• Spines of all 12 acromion &
thoracic upper lip
vertebra of crest of
spine of
scapula
Latissimus dorsi • T7-L5 Floor of Thoracodorsal Extends & rotates th
• Outer lip of iliac intertubercula nerve humerus medially
crest r sulcus Powerful adductor
• Inferior angle of Climbing,swimming
scapula
, Levator scapulae Medial border of Dorsal Both rhomboideus
scapula - scapular retracts the scapula
nerve
Rhomboideus major &
minor
Supraspinatus supra-spinous fossa The greater Supra Initiation of
of the tubercle of -scapular abduction of
scapula the humerus nerve [C5,C6] arm (0-15°) at
shoulder joint
Infraspinatus infra-spinous fossa The greater Supra Lateral rotation of
of the tubercle of -scapular arm at
scapula the humerus nerve [C5,C6] the shoulder joint
Teres minor Upper 2/3 of lateral Greater Axillary nerve Lateral rotation of
border of the tubercle of the C5,6 arm at
posterior surface of humerus the shoulder joint
the scapula
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