Nothing Special   »   [go: up one dir, main page]
Scribd Logo
Upload

Welcome to Scribd!

  • 156 views

    Axillary Nerve

    Uploaded by

    shrishti shadangi
    The axillary nerve supplies the deltoid muscle, which is the main abductor of the arm. It is commonly injured during shoulder dislocations and fractures of the surgical neck of the humerus. The axillary nerve arises from the brachial plexus and provides motor innervation to the deltoid muscle and teres minor muscle. Damage results in paralysis of these muscles and loss of abduction power in the shoulder.

    Copyright:

    © All Rights Reserved
    Download as PPTX, PDF, TXT or read online from Scribd

    Axillary Nerve

    Uploaded by

    shrishti shadangi
    156 views17 pages
    The axillary nerve supplies the deltoid muscle, which is the main abductor of the arm. It is commonly injured during shoulder dislocations and fractures of the surgical neck of the humerus. The axillary nerve arises from the brachial plexus and provides motor innervation to the deltoid muscle and teres minor muscle. Damage results in paralysis of these muscles and loss of abduction power in the shoulder.

    Original Title

    AXILLARY NERVE.pptx

    Copyright

    © © All Rights Reserved

    Available Formats

    PPTX, PDF, TXT or read online from Scribd

    Did you find this document useful?

    Is this content inappropriate?

    The axillary nerve supplies the deltoid muscle, which is the main abductor of the arm. It is commonly injured during shoulder dislocations and fractures of the surgical neck of the humerus. The axillary nerve arises from the brachial plexus and provides motor innervation to the deltoid muscle and teres minor muscle. Damage results in paralysis of these muscles and loss of abduction power in the shoulder.

    Copyright:

    © All Rights Reserved
    Download as PPTX, PDF, TXT or read online from Scribd
    Download as pptx, pdf, or txt
    156 views17 pages

    Axillary Nerve

    Uploaded by

    shrishti shadangi
    The axillary nerve supplies the deltoid muscle, which is the main abductor of the arm. It is commonly injured during shoulder dislocations and fractures of the surgical neck of the humerus. The axillary nerve arises from the brachial plexus and provides motor innervation to the deltoid muscle and teres minor muscle. Damage results in paralysis of these muscles and loss of abduction power in the shoulder.

    Copyright:

    © All Rights Reserved
    Download as PPTX, PDF, TXT or read online from Scribd
    Download as pptx, pdf, or txt
    of 17

    AXILLARY NERVE

    AXILLARY NERVE
    Introduction
    Axillary or circumflex nerve is an important nerve.
     Because it supplies the deltoid muscle.
    Deltoid muscle is the main abductor of the arm.
    Surgically it is important, because axillary nerve is
    commonly involved in dislocations of the shoulder and in
    fractures of the surgical neck of the humerus.
    The axiliary nerve is a branch of the posterior cord of the
    brachial plexus(C5,C6).
    Root value:-
     Its root value is ventral rami of C5 and C6 segments of
    spinal cord.
    Surface marking
     Axillary nerve is marked as a horizontal line on the
    deltoid muscle 2 cm above the mid point between the
    tip of the acromion process and insertion of the
    deltoid muscle
    Course and Relations:-
    A) In the lower part of the axilla,the nerve runs
    downwards behind the third part of the axillary
    artery.
     Here it lies on the subscapularis muscle.
    It is related, medially to the median nerve, and
    laterally to the coracobrachialis.
    The nerve leaves the axilla by winding round the
    lower border of the subscapularis in close relation to
    the lowest part of the capsule of the shoulder joint,
    and enters the quadrangular space.
    B) The nerve then passes backwards through the
    quadrangular space.
    Here it is accompanied by the posterior circumflex
    humeral vessel and has the following relation.
    Superiorly:
    (i)Subscapularis
    (ii) Lowest part of the capsule of the shoulder joint.
    (iii) Surgical neck of humerus
    Inferiorly:
    Teres major.
    Medially:
     Long head of the triceps brachii
     In the quadrangular space, the nerve divides into
    anterior and posterior branches in relation to
    the deltoid muscle
    (c) The anterior branch is accompanied by the posterior
    circumflex humeral vessels.
     It winds round the surgical neck of the humerus, deep to
    the deltoid..
     It supplies the deltoid and the skin over its anteroinferior
    part.
    (d) The posterior branch supplies the teres minor and the
    posterior part of the deltoid.
     The posterior branch then pierces the deep fascia at the
    lower part of the posterior border of the deltoid and
    continues as the upper lateral cutaneous nerve of the
    arm.
    Anastomoses around the Scapula.
    Anastomosis around the body of the Scapula
    The anastomosis occurs in three fossae, Subscapular,
    supraspinus and infraspinus.
    The suprascapular artery, a branch of the thyrocervical
    trunk.
     The deep branch of the transverse cervical artery another
    branch of the thyrocervical trunk
    The circumflex scapular artery a branch of subscapular
    artery arise from the 3rd part of the axillary artery.
    Anastomosis over the acromion process.
    It is formed by
    The acromial branch of thoroco acromial artery
    Acromial branch of suprascapular artery
    Acromial branch of posterior rcircumflex artery, its is also
    anostomosis between the 1st part of the subclavian artery and
    3rd part of the axillary artery.
    CLINICAL ANATOMY
    Intramuscular injections are often give into the
    deltoid. They should be given in the middle of the
    muscle to avoid injury to the axillary nerve.
    The axillary nerve may be damaged by dislocation of
    the shoulder or by the fracture of the surgical neck
    of the humerus.
    The effects produced are
    (a) Rounded contour of shoulder is lost;greatertubercle of
    humerus becomes prominent.
    (b) Deltoid is paralysed with loss of the power of abduction
    up to 90*at the shoulder.
    (c) There is sensory loss over the lower half of the deltoid.
    Axillary Nerve Lesion: Causes
    1
    The axillary nerve is
    usually injured due to: 3
    1. Fracture of
    surgical neck of
    the humerus.
    2. Downward
    2
    dislocation of
    the shoulder
    joint
    3. Compression.
    from the
    incorrect use of
    crutches.
    Axillary Nerve Lesion: Effects
    Motor:
    • Paralysis of the deltoid and
    teres minor muscles.
    • Impaired abduction of the
    shoulder (30-90˚).
    • The paralyzed deltoid wastes
    rapidly.
    • As the deltoid atrophies, the
    rounded contour of the
    shoulder is flattened
    compared to the uninjured
    side.
    Sensory: Loss of sensation
    over the lateral side of the
    proximal part of the arm.

    You might also like