Summary confused about anotomy of muscles of shoulder ? Here are basic points that need to know

ANATOMY OF SHOULDER


PECTORALIS MAJOR

ORIGIN

 CLAVICULAR PART: MEDIAL ANTERIOR CLAVICLE

 STERNAL PART: STERNAL AND COASTAL
CARTILAGES (II – VI)

INSERTION

 CREST OF GREATER TUBERCLE [LATERAL RIDGE OF
BICIPITAL GROOVE]

INNERVATION

 LATERAL+MEDIAL PECTORAL NERVES {C5-T1}

ACTION

 ADDUCTS, FLEX, MEDIALLY ROTATES AND EXTENDS THE SHOULDER

 CAN CONTRIBUTE TO INSPIRATION

FUN FACTS

 KNOWN AS HUGGING MUSCLE BECAUSE IT PULLS THE ARMS TOWARDS CHEST
 KEY MUSCLE FOR PUSHING MOVEMENTS IN BENCH PRESS ACTIVITIES
 HELPS PROTECT VITAL ORGANS LIKE HEART AND LUNGS BECAUSE IT IS A BROAD
MUSCLE COVERING THE CHEST




PECTORALIS MINOR

, ORIGIN

 OUTER SURFACE OF 3RD TO 5TH RIBS

INSERTION

 UPPER SURFACE AND MEDIAL BORDER OF
COROCOID PROCESS

INNERVATION

 LATERAL+MEDIAL PECTORAL NERVES {C5-T1}

ACTION

 PROTRACTS AND MEDIALLY ROTATES SCAPULA

FUN FACTS

 THIS MUCLE IS CALLED AS BREATHING HELPER
BECAUSE IT HELPS THE RIBS TO AID DEEP
INHALATION

 LIES UNDERNEATH PEC MAJOR MUSCLE, ACTING LIKE ITS SMALLER ASSISTANT

 WORKS AS POSTURAL STABILIZER, KEEPING THE SHOULDER BLADE (SCAPULA) IN
PLACE


DELTOID
ORIGIN

 ANTERIOR FIBER: ANTERIOR BORDER OF ⅓ OF CLAVICLE

 MEDIAL FIBER: LATERAL MARGIN OF
ACROMION PROCESS

 POSTERIOR FIBER: LOWER EDGE OF CREST
OF SPINE OF SCAPULA

INSERTION

 DELTOID TUBEROSITY OF HUMERUS

INNERVATION

 AUXILLARY NERVES {C5-C6}

ACTION

 AF: FLEX AND MEDIALLY ROTATES SCAPULA