1.3 Intrinsic Muscle of the Thoracic Limb: Lateral Muscles of the Scapula and Shoulder

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Lateral Muscles of the Scapula and Shoulder

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7 Terms

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Deltoideus

Infraspinatus

Teres minor

Supraspinatus

name the lateral muscles of the scapula and shoulder (4)

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Deltoideus

  • Its aponeurosis covers the infraspinatus muscle.

  • divided into a scapular part and an acromial part

  • Origin: extends from the scapular spine and acromion over the shoulder joint

  • Insertion: the deltoid tuberosity of the humerus.

  • Action: It acts to flex the shoulder

  • Innervation: Axillary nerve

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Scapular part of the deltoideus

  • flat fusiform muscle which lies superficial to the inferior portion of the infraspinatus

  • muscle fibers runs parallel into the length of the scapular spine

  • Origin: Spine of scapula

  • Insertion: deltoid tuberosity

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Infraspinatus

  • lies deep to the aponeurosis of the deltoid muscle and it originates from infraspinous fossa.

  • Its strong tendon crosses the shoulder joint to insert on the greater tubercle of humerus.

  • Origin: Infraspinous fossa

  • Insertion: lateral side of the greater tubercle

  • Action: to extend or flex and stabilize the shoulder joint

  • Innervation: Suprascapular nerve

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Teres minor

  • small, wedged shaped muscle ventral to the tendon of insertion of the infraspinatus muscle.

  • It crosses the lateral surface of the shoulder.

  • lies caudolateral aspect of the joint between deltoideus and infraspinatus muscle

  • Origin: Infraglenoid tubercle and caudal border of the scapula

  • Insertion: teres minor tuberosity

  • Action: to flex the shoulder and rotate the arm laterally

  • Innervation: Axillary nerve

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Supraspinatus

  • shoulder extensor; originates and fills the supraspinous fossa.

  • covered by the cervical part of the trapezius muscle and omotransversarius muscle

  • wider and larger than the infraspinatus

  • Origin: supraspinous fossa

  • Insertion: greater tubercle (by a thick tendon)

  • Action: to extend and stabilize the shoulder joint

  • Innervation: Suprascapular nerve

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FALSE, only the long head and lateral head is seen in the lateral aspect

TRUE OR FALSE: the long head, lateral head and the medial head is seen on the lateral aspect of the limb