ANAT 1615 Lecture Notes - Upper Extremity (Mercy Navis)

ANAT 1615 Lecture Notes - Upper Extremity (Mercy Navis) -...

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UPPER EXTREMITY Clavicle 1. medial end articulates with the clavicle and forms the sternoclavicular joint 2. lateral end articulates with the acromion process of the scapula and forms the acromioclavicular joint 3. shaft inferior surface - subclavian groove for the insertion of subclavius muscle Scapula 1. acromion process a) articulates with the lateral end of the clavicle and forms the acromioclavicular joint b) acromioclavicular joint is a synovial joint 2. coracoid process a) superior surface for the insertion of pectoralis minor b) tip gives origins of coracobrachialis and short head of biceps brachii Deltopectoral triangle Space bordered by 1. clavicle 2. clavicular head of pectoralis major 3. anterior border of deltoid muscle Breast in females, located in the superficial fascia, superficial to pectoralis major muscle Mammary gland is made of glandular tissue Lactiferous ducts are15 to 20 ducts deep to the nipple and areola, drain the milk from the glandular tissue to the nipple Areola is a circularly arranged pigmented skin surrounding the nipple Nipple is the cylindrical prominence within the center of the areola Suspensory ligament of the breast are the fibrous bands that connect the deep fascia to the skin Retromammary space lies between the deep fascia of pectoralis major and the breast Clavipectoral fascia lies deep to the clavicular head of pectoralis major It begins from the clavicle and envelops two muscles, pectoralis minor and subclavius It is pierced by the following structures 1. cephalic vein ( joins the axillary vein ) 2. thoracoacromial artery ( branch of axillary artery ) 3. lateral pectoral nerve ( branch of lateral cord of brachial plexus )
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Supensory ligament of the axilla is the continuation of the clavipectoral fascia into the axillary region Pectoral region Muscles 1. pectoralis major 2. pectoralis minor 3. subclavius 4. serratus anterior Pectoralis major Origin 1. medial half of the clavicle 2. anterior surface of sternum 3. 1-6 costal cartilages Insertion - into the lateral lip of the intertubercular sulcus ( bicepetal grove ) of the humerus Nerve supply - medial pectoral ( medial cord ) and lateral pectoral ( lateral cord ) nerves of brachial plexus Actions 1. adduction of arm 2. medial rotation of arm 3. flexion of the humerus at the shoulder joint Pectoralis minor Origin - from the ribs 3-5 near the costal cartilages Insertion - into the superior surface of coracoid process of scapula Nerve supply - medial pectoral ( medial cord ) and lateral pectoral ( lateral cord ) nerves of brachial plexus Actions 1. depresses the tip of the shoulder 2. protracts the scapula Subclavius Origin - from rib # 1 near the costochondral junction Insertion - into the floor of the subclavian groove, the inferior surface of middle third of clavicle Nerve supply Nerve to subclavius from the upper trunk of brachial plexus Action - depresses and anchors the clavicle
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Serratus anterior Origin - from 1-8 ( 9 ) ribs by eight digitations Insertion - into the medial border of scapula on the ventral or costal surface
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This note was uploaded on 11/21/2011 for the course ANAT 1615 taught by Professor Samueldemons during the Fall '10 term at Life Chiropractic College West.

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ANAT 1615 Lecture Notes - Upper Extremity (Mercy Navis) -...

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