ANATOMY-UB-ROTATOR CUFF-MUSCLES


ANATOMY – MUSCLES – ROTATOR CUFF 


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S.I.T.S. MUSCLES: Supraspinatus | Infraspinatus | Teres Minor | Subscapularis
· These muscles work in unison to stabilize the shoulder – Physiopedia .
· These muscles are involved in other actions other than External & Internal Rotation
· Lateral Raises Full Can & Empty Can: E3 Rehab .
· Rows; Lat Pulls; Chin-ups; Pull-ups
· External/Lateral Rotation & Internal/Medial Rotation Exercises

  1. SUPRASPINATUS
    (1) Function: Lateral Raise variations of angle & hand position
    – Primary Abductor of the arm from 0 to 15º (Lateral Raises)
    – Assists Deltoid from 0 to 90º reaching peak forces from 30 to 60º (Lateral Raises )
    (2) Origin: Supraspinatus Fossa of the Scapula
    (3) Insertion: Superior Facet of the Greater Tuberosity of the Humerus
    (4) Nerve Supply: Suprascapular Nerve, C5 & 6, Superior Trunk of the Brachial Plexus
  2. INFRASPINATUS
    (1) Function:
    – External/Lateral Rotation (Exorotation) of the arm (multiple specific exercises)
    – Assists in Shoulder Extension (approx. shoulder width Rows, Lat Pulls, Chins)
    – Abducts inferior angle of scapula when arm is fixed
    (2) Origin: Infraspinatus fossa of scapula
    (3) Insertion: The posterior aspect of Greater Tuberosity of Humerus, and the capsule of shoulder joint
    (4) Nerve Supply: Suprascapular Nerve (C5 & C6)
  3. TERES MINOR
    (1) Function:
    – External/Lateral Rotation (Exorotation) of the arm (multiple specific exercises)
    – Assists in Adduction and Extension of the shoulder (Rows, Lat Pulls, Chins)
    (2) Origin: upper 2/3 of the lateral border of the scapula
    (3) Insertion: Greater Tubercle of the Humerus
    (4) Nerve Supply: axillary nerve (roots C5, C6) from the posterior cord of the Brachial Plexus
  4. SUBSCAPULARIS
    (1) Function:
    – Internal/Medial Rotation (Endorotation) of the arm (multiple specific exercises)
    – Adduction & Extension when the arm is elevated (Lat Pulls & Chins)
    (2) Origin: Medial 2/3 of the Subscapular Fossa of the Scapula
    (3) Insertion: Lesser Tuberosity of the Humerus
    (4) Nerve Supply: Upper and Lower Subscapular Nerves (C5-C6); Posterior Cord of the Brachial Plexus

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