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بسم الله الرحمن الرحيم. BACK MUSCLES A- SUPERFICIAL LAYER The superficial layer is formed of two muscles: 1- Trapezius 2- latissimus dorsi.

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Presentation on theme: "بسم الله الرحمن الرحيم. BACK MUSCLES A- SUPERFICIAL LAYER The superficial layer is formed of two muscles: 1- Trapezius 2- latissimus dorsi."— Presentation transcript:

1 بسم الله الرحمن الرحيم

2 BACK MUSCLES A- SUPERFICIAL LAYER The superficial layer is formed of two muscles: 1- Trapezius 2- latissimus dorsi

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6 1- Trapezius muscle Origin: External occipital protuberanceExternal occipital protuberance, superior nuchal line of the occipital bone. superior nuchal lineoccipital bone From the ligamentum nuchae, the spinous process of the seventh cervical.ligamentum nuchae spinous process The spinous processes of all the thoracic vertebrae. thoracic vertebrae Insertion: Posterior border of the lateral third of the clavicle.clavicle The medial margin of the acromion.acromion The superior lip of the posterior border of the spine of the scapula.spine of the scapula

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8 1- Trapezius muscle Nerve supply: Spinal part of accessory nerve (CN XI).accessory nerve The ventral rami of the third (C3) and fourth (C4) cervical nerves carries proprioception sensation.ventral ramithird (C3)fourth (C4)cervical nervesproprioception Action: 1-The upper fibres elevate the shoulder. 2-The lower fibres depress the scapula. 3-The middle fibres retract the scapula.

9 2- Latissimus dorsi muscle Origin:  spinous processes of T7-T12  supraspinous ligament.  thoracolumbar fascia. thoracolumbar fascia  outer lip of iliac crest.iliac crest  inferior 3 or 4 ribs.  inferior angle of scapula Insertion: Floor of bicipital groove of the humerus.bicipital groovehumerus Nerve supply: Nerve to latissmus dorsi (C6,C7,C8). Action: Adducts, extends and medially rotates the arm.

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11 B- DEEP LAYER The deep layer is formed by : 1-levator scapulae 2- Rhomboideus minor 3- Rhomboideus major muscles.

12 1- Levator scapulae muscle Origin: Transverse processesTransverse processes of C1 - C4 vertebrae. Insertion: Medial border of dorsal surface of scapulaMedial border of dorsal surface of scapula from the superior angle to the spine. Nerve supply: Dorsal scapular nerveDorsal scapular nerve (C5). Action: ElevatesElevates scapula.scapula

13 2- Rhomboidus minor muscle Origin: Nuchal ligamentsNuchal ligaments and spinous processes of C7 to T1 vertebrae.spinous processes Insertion: Small area of medial border of dorsal surface of scapula at level of spine. Nerve supply: Dorsal scapular nerveDorsal scapular nerve (C5). Action: 1-Retracts1-Retracts the scapulascapula 2-Rotates the scapula so that the glenoid cavity faces downwards (depress the shoulder).glenoid cavity

14 3- Rhomboideus major muscle Origin: Spinous processesSpinous processes of the T2 to T5 vertebrae. Insertion: Medial border of the scapulaMedial border of the scapula, inferior to the insertion of rhomboideus minor muscle. rhomboideus minor muscle Nerve supply: Dorsal scapular nerveDorsal scapular nerve (C5). Action: RetractsRetracts the scapula and rotates the scapula so that the glenoid cavity faces downwards.scapulaglenoid cavity

15 SCAPULAR REGION

16 Supraspinatus muscle Origin: Supraspinous fossa Supraspinous fossa (medial2/3) of scapula.scapula Insertion: Superior facet of greater tuberosity of humerus.greater tuberosityhumerus Nerve supply: Suprascapular nerveSuprascapular nerve(C5,C6). Action: AbductionAbduction of arm from 0˚-18˚.

17 Infraspinatus muscle Origin: Infraspinous fossa Infraspinous fossa (medial2/3) of scapula.scapula Insertion: Middle facet at the back of the greater tuberosity of the humerus.greater tuberosityhumerus Nerve supply: Suprascapular nerve Suprascapular nerve (C5,C6). Action: Lateral rotationLateral rotation of arm.

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19 Teres minor muscle Origin: Lateral borderLateral border(upper 2/3) of the scapula.scapula Insertion: Inferior facet at the back of the greater tuberosity of the humerus.greater tuberosityhumerus Nerve supply: Axillary nerve (C5,C6)Axillary nerve (C5,C6). Action: Lateral rotationLateral rotation and adduction of arm.

20 Teres major muscle Origin: Posterior aspect of the inferior angle of the scapula. inferior anglescapula Insertion: Medial lip of bicipital groove of the humerus.humerus Nerve supply: Lower subscapular nerve Lower subscapular nerve (C5,C6). Action: Medial rotation,adduction and extension of the humerus. humerus

21 Subscapularis muscle Origin: Subscapular fossaSubscapular fossa (medial 2/3). Insertion: Lesser tuberosityLesser tuberosity of humerus.humerus Nerve supply: Upper andUpper and lower subscapular nerves (C5, C6).lower subscapular nerve Action: Rotates the humerus mediallyRotates the humerus medially.

22 Deltoid muscle Origin: anterioranterior border of lateral 1/3 of clavicle.,lateral margin of the acromion andacromion crest of the spine of the scapula.spine of the scapula Insertion: Into deltoid tuberosity on the middle of the lateral aspect of the shaft of the humerus.deltoid tuberositylateral humerus Nerve supply: Axillary nerveAxillary nerve (C5, C6). Action:  Anterior fibers: flexion and medial rotation of humerus.  Middle fibers: abduction from1 8˚-90˚.  Posterior fibers: extension and lateral rotation of humerus.

23 ROTATOR CUFF MUSCLES Rotator cuff muscles surround the shoulder joint, they include: Subscapularis. Supraspinatus. Infraspinatus. Teres minor.

24 INTERMUSCULAR SPACES 1- Quadrangular space: Boundaries It is bounded by: Superiorly: Teres minor.Teres minor Inferiorly: Teres major.Teres major Medially: the long head of the Triceps brachii. Triceps brachii Laterally: the surgical neck of the humerus.surgical neck of the humerus Contents It transmits the axillary nerve and posterior circumflex humeral artery.axillary nerveposterior circumflex humeral artery

25 2-Medial triangular space Boundaries: Teres minor Teres minor superiorly. Teres major Teres major inferiorly. Long head of the Triceps laterally. Triceps Contents: It contains the circumflex scapular vessels. circumflex

26 3- Lateral triangular space Boundaries: Teres major Teres major superiorly. Long head of the Triceps medially. Triceps Humerus laterally. Contents: The radial nerve and profunda brachii artery.radial nerve profunda brachii artery

27 Thank You


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