Superficial and Deep Muscles of Neck, Shoulder. Back and Gluteal Region

Question 1

what is the origin, insertion, action and innervation of the trapezius

Answer 1

origin: skull, cervical and thoracic vertebrae
insertion: clavicle, acromion, spine of scapula
action: upward rotation, elevation and depression of the scapula
innervation: (CN XI) Accessory Nerve

Question 2

what is the origin, insertion, action and innervation of the latissimus dorsi

Answer 2

origin: thoracic and lumar vertebrae, sacrum, iliac crest
insertion: intertubercular groove of the humerus
action: adduction, extension, medial rotation of the arm
innervation: thoracodorsal nerve

Question 3

what is the origin, insertion, action and innervation of the levator scapula

Answer 3

origin: cervical vertebrae C1 to C4
insertion: medial border of the scapula above the level of the scapular spine
action: elevation of the scapula
inneration: cervical spinal nerves c3 & c4, accesory nerve

Question 4

what is the origin, insertion, action and innervation of the Rhomboid Minor

Answer 4

Origin: Cervical vertebrae C7 and Thoracic Vertebrae T1

Insertion: Medial border of the scapula at the level of the scapular spine

Action: Adduction of the scapula

Innervation: Dorsal scapular nerve

Question 5

what is the origin, insertion, action and innervation of the Rhomboid Major

Answer 5

Origin: Thoracic Vertebrae T2 through T5

Insertion: Medial border of the scapula below the level of the scapular spine

Action: Adduction of the scapula

Innervation: Dorsal scapular nerve

Question 6

what is the origin, insertion, action and innervation of the Deltoid

Answer 6

Origin: spine of the scapula, acromion, clavicle

Insertion: deltoid tuberosity of the humerus

Action: flexion, extension, abduction medial and lateral rotation of the arm at the shoulder joint

Innervation: Axillary nerve

Question 7

what is the origin, insertion, action and innervation of the Supraspinatus

Answer 7

Origin: supraspinous fossa

Insertion: greater tubercle of humerus

Action: abduction of the arm at the shoulder joint

Innervation: suprascapular nerve

*Rotator Cuff Muscle

Question 8

what is the origin, insertion, action and innervation of the Infraspinatus

Answer 8

Origin: infraspinous fossa

Insertion: greater tubercle of humerus

Action: lateral rotation of the arm at the shoulder joint

Innervation: suprascapular nerve

*Rotator Cuff Muscle

Question 9

what is the origin, insertion, action and innervation of the Teres Minor

Answer 9

Origin: lateral border of the infraspinous fossa
Insertion: greater tubercle of humerus
Action: lateral rotation of the arm at the shoulder joint
Innervation: axillary nerve
*Rotator Cuff Muscle

Question 10

what is the origin, insertion, action and innervation of the Teres Major

Answer 10

Origin: inferior angle of the infraspinous fossa
Insertion: crest of the lesser tubercle of humerus
Action: adduction and medial rotation of the arm at the shoulder joint
Innervation: lower subscapular nerve

Question 11

what is the origin, insertion, action and innervation of the Gluteus Maximus

Answer 11

Origin: Ilium, Sacrum and Coccyx
Insertion: Gluteal Tuberosity
Action: Extension and lateral rotation of the thigh at the hip joint
Innervation: Inferior Gluteal n.

Question 12

what is the origin, insertion, action and innervation of the Gluteus Medius

Answer 12

Origin: Ilium
Insertion: Greater Trochanter
Action: Abduct and medially rotate thigh at the hip joint
Innervation: Superior Gluteal n.