ANATOMY 2221 Superficial and Deep Back.pdf

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Western University
Anatomy and Cell Biology
Anatomy and Cell Biology 2221
Brian L Allman

Superficial Back and Deep Back September-17-13 2:29 PM The trapezius can perform different movements at different locations The main action of these muscles is at the shoulder The accessory nerve (11th cranial) innervates the trapezius (worrier's muscle) - Shoulder shrugs (elevation) The axillary nerve innervates the deltoid - Shoulder extension, flexion medial and lateral rotation of arm abduction The thoracodorsal nerve innervates the Latissimus Dorsi - Internal rotation or arm "power stroke" - Extension, adduction and medial Rotation of arm Dorsal Scapular Nerve Assists the trapezius in elevating the arm Suprascapular Nerve - Supraspinatus Assists the trapezius in retracting the arm - Infraspinatus Assists the trapezius in retraction, and rotation of scapula Axillary Nerve Starts abduction and lies in the suprascapular fossa - Deltoid - Assists the deltoid - Teres minor Attach to the greater tubercle of the humerus - Laterally rotates arm Attaches to the intertubercular sulcus of the humerus Attach to the lesser tubercle of the humerus Lateral border of trapezius Upper border of Latissimus Dorsi Medial border of scapula 1- Trapezius 2- Deltoid 3- Infraspinatus *know inervated nerves 4- Teres Major *know actions 5- Latissimus Dorsi Responsible for two groups of muscles 1. Erector Spinae a. Spinalis - Hugging the spines of the spinal column b. Longissimus c. Iliocostalis - Attaching to the illium to the ribs - From the sacroilliac region to the neck 2. Transversospinalis Group - Attach transverse to spinous processes a. Semispinalis b. Multifidi c. Rotatores As well as... I Like Standing 3. Splenius Capitis (upper) and Cervicis (lower) Rotatores muscle is deep to the semispinalis and multifidus muscles Rhomboid Major - Attached to scapula and vertebral columb Iliocostalis Longissimus Spinalis Hyperextension (bending back) Lower (L4, L5), deep muscles attach to lower vert Rowing, weight lifting, improper lifting Spondyloysis- stress fracture of vertebrae Zygapophyseal Joints (facet joints) Muscle and Nerve Chart September-19-13 10:47 PM Superficial Scapular Muscles Muscle Origin Insertion Function Innervated By Trapezius Spinous processesof C7 to T12 Superior edge of spine of scapula Elevates Accessory "worrier's" Posterior clavicle Depresses and retracts nerve Medial Acromion Rotates the scapula upward Deltoid Lateralacromion Deltoid tuberosity of humerus Flexes and extends Axillary nerve Inferior edge of spine of Medially and laterally rotates scapula Abducts the arm Latissimus Spinous processesof T7 to T12 Intertubercular sulcus of humerus Extends Thoracodorsal Nerve Dorsi Thoracolumbarfascia Adducts Iliac crest Medially rotates arm Ribs 3 to 4 Deep ScapularMuscles Muscle Origin Insertion Function Innervated By Levator Posterior tuberclesof Medial border of scapula above Elevates Dorsal scapular nerve Scapulae transverseprocessesof C1-C4 base of spine Rotates the scapula downward Rhomboid Spinous processesof C7-T1 Medial border of scapula at base Retracts scapula Dorsal scapular nerve minor of spine of scapula Rotates the scapula downward Rhomboid Spinous processesof T2-T5 Medial border of scapula below Retracts Dorsal scapular nerve major base of spine of scapula Rotates the scapula downward Supraspinatus Supraspinousfossa of scapula Superior facet of greater tubercle Abducts arm (initiates) Suprascapular nerve of humerus Infraspinatus Infraspinousfossa of scapula Middle facet of greater tubercle Laterally rotates arm Suprascapular nerve of humerus Teres Minor Upper 2/3 of posteriorsurface Inferior facet of greater tubercle Laterally rotates arm Axillary nerve of lateral borderof scapula of humerus Teres Major Posteriorsurface of inferior Medial lip of intertubercular Adducts arm Subscapular nerve angle of scapula0 sulcus Medially rotates arm Subscapularis
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