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Questions and Answers
Which muscle is primarily responsible for the abduction of the arm?
Which nerve provides cutaneous innervation to the upper lateral part of the arm?
What is the function of the deltoid muscle's middle part?
Which muscles make up the Rotator Cuff?
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Which muscle is innervated by the lower subscapular nerve?
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Which action is NOT performed by the Teres minor muscle?
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The suprascapular nerve innervates which muscles?
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What action does the Subscapularis muscle primarily perform?
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Study Notes
Cutaneous Innervation
- Supraclavicular nerve (cervical plexus)
- Upper lateral cutaneous nerve of arm (axillary nerve)
- Medial cutaneous nerve of arm (brachial plexus)
- Posterior cutaneous nerve of arm (radial nerve)
Deep Fascia
- Deltoid fascia
Deltoid Muscle
- Origin: Lateral 1/3rd of clavicle
- Insertion: Deltoid tuberosity
- Action: Flexion and medial rotation of arm
- Nerve supply: Axillary nerve (C5, C6)
Deltoid Muscle (Middle/Acromial part)
- Chief abductor of arm
Deltoid Muscle (Post/Spinous part)
- Extension and lateral rotation of arm
- Nerve supply: Axillary nerve (C5, C6)
Supraspinatus Muscle
- Origin: Supraspinous fossa
- Insertion: Sup facet on greater tuberosity
- Action: Abducts humerus
- Nerve supply: Suprascapular nerve (C4, C5, C6)
Infraspinatus Muscle
- Origin: Infraspinous fossa
- Insertion: Middle facet on greater tubercle
- Action: Laterally rotates humerus
- Nerve supply: Suprascapular nerve (C5, C6)
Teres Minor Muscle
- Origin: Sup part of lateral border of scapula
- Insertion: Inferior facet on greater tubercle
- Action: Laterally rotates humerus
- Nerve supply: Axillary nerve (C5, C6)
Teres Major Muscle
- Origin: Dorsal surface of inferior angle of scapula
- Insertion: Medial lip of intertubercular groove
- Action: Adducts and medially rotates humerus
- Nerve supply: Lower subscapular nerve (C6, C7)
Subscapularis Muscle
- Origin: Subscapular fossa
- Insertion: Lesser tubercle of humerus
- Action: Medially rotates humerus
- Nerve supply: Upper and lower subscapular nerves (C5, C6, C7)
Muscles Inserting to Greater Tubercle:
- Supraspinatus (suprascapular nerve)
- Infraspinatus (suprascapular nerve)
- Teres minor (axillary nerve)
Rotator Cuff
- SITS (Supraspinatus, Infraspinatus, Teres Minor, Subscapularis Muscles)
- Rotator cuff muscles hold the head of humerus within the glenoid cavity.
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Description
This quiz covers the anatomy and innervation of key shoulder muscles, including the deltoid, supraspinatus, infraspinatus, and teres minor. Test your knowledge of the origins, insertions, actions, and nerve supplies associated with these muscles. Ideal for students of anatomy and physiology.
