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    Anatomy

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    hananabodeaf41
    The document summarizes the muscles of the upper limb including: - Muscles of the pectoral region, shoulder, arm, and forearm such as the pectoralis major, deltoid, biceps, and pronator teres. - It also describes the origin, insertion, action and nerve supply of each muscle. - Finally, it provides an overview of the main nerves of the upper limb including the axillary, musculocutaneous, and radial nerves; and describes their origin, course, and branches.

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    Anatomy

    Uploaded by

    hananabodeaf41
    21 views5 pages
    The document summarizes the muscles of the upper limb including: - Muscles of the pectoral region, shoulder, arm, and forearm such as the pectoralis major, deltoid, biceps, and pronator teres. - It also describes the origin, insertion, action and nerve supply of each muscle. - Finally, it provides an overview of the main nerves of the upper limb including the axillary, musculocutaneous, and radial nerves; and describes their origin, course, and branches.

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    The document summarizes the muscles of the upper limb including: - Muscles of the pectoral region, shoulder, arm, and forearm such as the pectoralis major, deltoid, biceps, and pronator teres. - It also describes the origin, insertion, action and nerve supply of each muscle. - Finally, it provides an overview of the main nerves of the upper limb including the axillary, musculocutaneous, and radial nerves; and describes their origin, course, and branches.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    21 views5 pages

    Anatomy

    Uploaded by

    hananabodeaf41
    The document summarizes the muscles of the upper limb including: - Muscles of the pectoral region, shoulder, arm, and forearm such as the pectoralis major, deltoid, biceps, and pronator teres. - It also describes the origin, insertion, action and nerve supply of each muscle. - Finally, it provides an overview of the main nerves of the upper limb including the axillary, musculocutaneous, and radial nerves; and describes their origin, course, and branches.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 5

    MUST

    Medical faculty

    anatomy department

    DR NAHED KOURA

    Muscles of the upper limb

    Muscles of the pectoral region:

    Name Origin insertion Action Nerve supply


    Pectoralis Medial ½ of the front Bilaminar tendon into Adduction, medial Lateral and
    major of the clavicle, the the lateral lip of the rotation and flexion medial
    anterior surface of the bicipital groove, the of shoulder joint pectoral
    sternum and upper 6 tendon is twisted to (arm) nerves
    costal cartilages form the anterior fold
    of axilla

    protract
    Pectoralis 3rd to 5th ribs near Upper surface of the raises the ribs during Medial
    minor their cartilages coracoid process near inspiration with fixed pectoral
    its tip scapula nerve scapula
    Serratus Outer surfaces of the 3 digitations into the Protracts the scapula Long thoracic
    anterior upper 8 ribs near their Ventral surface of the Or fix scapula and nerve
    angles medial border of move the ribs in
    scapula and the lower forced inspiration
    5 digitations into abduction
    inferior angle of the more than
    scapula 90
    Muscles of the shoulder:
    Deltoid Anterior fibers: Deltoid tuberosity On the arm: Axillary nerve
    Lateral ⅟3 of the in the middle of Anterior fibers
    clavicle; middle the lateral surface Flexion with
    fibers: from of the shaft of the medial rotation,
    acromion; humerus middle fibers
    posterior fibers: abduction from
    from spine of 15
    18-90 degrees
    scapula posterior fibers
    extension with
    lateral rotation
    Rotator cuff: From scapula: Into humerus On the arm
    1. Supraspinatus Supraspinous Upper part of the Abduction of arm Suprascapular
    fossa greater tuberosity 15
    18 degrees nerve
    2. Infraspinatus Infraspinous fossa Middle part of Lateral rotation of Suprascapular
    greater tuberosity arm nerve

    3. Teres minor Upper ⅔ of lateral Lower part of Lateral rotation of Axillary nerve
    border greater tuberosity arm

    4. Subscapularis
    Subscapular fossa Lesser tuberosity Adduction and Upper and
    medial rotation of lower
    arm subscapular
    Teres major Lower ⅟3 of In the medial lip of Adduction, medial Lower
    lateral border of the intertubercular rotation and subscapular
    scapula groove of the extension of arm
    humerus
    Muscles of the arm:
    Biceps From scapula: Long A tendon into the Powerful supinator Musculo-
    head from radial tuberosity of and Flexor of elbow cutaneous
    supraglenoid tubercle radius and a bicipital joint nerve
    and short head from aponeurosis blends
    coracoid process with the deep fascia of
    the forearm

    Brachialis Lower half of the front Into the front of the The main flexor of Musculo-
    of the shaft of the coronoid process of the the elbow joint Cutaneous
    humerus ulna and radial
    nerves
    Triceps Long head from the Into the posterior part The main extensor of Radial
    infraglenoid tubercle of the upper surface of the elbow nerve; a
    Lateral head from a the olecranon process branch for
    ridge in back of the of the ulna. Some of each head.
    humerus above spiral the deep fibers pass to The long
    groove the fibrous capsule of head has its
    Medial head from the the elbow joint. branch in
    back of the humerus axilla
    below spiral groove

    Muscles of the front of the forearm:

    Name of a muscle Anatomy of a muscle


    1- Pronator teres
    Origin: Humeral head from the lower 1/3 of the medial
    supracondylar
    Ridge and common flexor origin. Ulnar head from the coronoid
    process of the ulna
    Insertion: The pronator tuberosity in the lateral surface of the
    radius
    Action: pronation and flexion of the fore arm
    Nerve supply: Median nerve
    Nerves of Upper Limb
    The axillary nerve:
    Origin and course:
    It arises from the posterior cord of the brachial plexus (C 5, 6) in the axilla. It passes backward
    Through the quadrangular space with medial circumflex humeral artery on the back of the
    surgical Neck of the humerus where it divides into anterior and posterior division.

    Branches:
    1- Articular branch to shoulder joint from the trunk.
    2- Anterior division gives anterior part of deltoid.
    3- Posterior gives teres minor, posterior part of deltoid and upper lateral cutaneous nerve
    of arm.

    The musculocutaneous nerve:


    Origin and course:
    It arises from the lateral cord of the brachial plexus in axilla. It pierces the coracobrachialis and
    runs Between biceps and brachialis. At the lateral margin of biceps; it pierces the deep fascia as
    the Lateral cutaneous nerve of the forearm.

    Branches:
    1- Muscular to coracobrachialis, biceps and brachialis.
    2- Articular branch to elbow joint
    3- Lateral cutaneous nerve of the forearm.

    Radial nerve
    Origin and course:
    1- In the axilla, it arises from the posterior cord of brachial plexus, it runs on the
    subscapularis and Tendons of latissimus dorsi and teres major.
    2- In the arm, it runs in the spiral groove.
    3- In the lateral side of the arm, it lies between the brachialis and brachioradialis
    4- It divides into superficial and deep divisions (branches) in front of the lateral epicondyle
    of the Humerus.

    Branches:
    In axilla: Posterior cutaneous nerve of arm
    Long head of triceps

    In the spiral groove:


    Lower lateral cutaneous nerve of arm
    Posterior cutaneous nerve of forearm
    Lateral and medial heads of triceps
    Anconeus

    In front of the lateral epicondyle:


    Brachialis
    Brachioradialis
    Extensor carpi radialis longus
    Elbow joint

    Terminal branches are two:


    Deep branch is the posterior interosseous nerve
    Superficial branch is the superficial radial nerve

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