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Part 1 Board Exams > Important Muscles > Flashcards

Important Muscles Flashcards

1
Q

Sternocleidomastoid: O and I

A

O: Mastoid process and lateral third of superior Nuchal line
I: Manubrium of sternum and medial third of clavicle

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2
Q

Sternocleidomastoid: Inn and action

A

Inn: Spinal part of CN XI (motor) and ventral rami C2,3 (proprioception)
Action: Tilts head towards same shoulder. Rotates head to opposite side.

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3
Q

Trapezius: O and I

A

O: Medial third of superior nuchal line, external occipital protuberance, ligamentum nuchae, spinous processes of C7 and all thoracic vertebrae
Insertion: Lateral third of clavicle, acromion and spine of scapula

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4
Q

Trapezius: Inn and action

A

Innervation: Spinal part of CN XI [motor] and branches of C3 and C4 [proprioception]
Action: Shrugs the shoulder, retracts and rotates the scapula

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5
Q

Latissimus Dorsi: O and I

A

Origin: Thoracolumbar fascia, spinous processes of the lower thoracic and lumbar vertebrae
Insertion: Floor of the bicipital groove

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6
Q

Lat Dorsi: Inn and Action

A

Innervation: Thoracodorsal nerve [C6, 7, 8]
Action: Adducts, extends and medially rotates the arm

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7
Q

Levator Scapulae: O and I

A

Origin: Transverse processes of C1 and C2 Posterior tubercles of the transverse processes of C3 and C4 Insertion: From the superior angle to the root of the spine of the scapula

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8
Q

Levator Scapulae: Inn and action

A

Innervation: Dorsal scapular nerve [C5]
Action: Elevates the scapula

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9
Q

Scalenus anterior: O and I

A

Origin: Anterior tubercles of the transverse processes of C3, 4, 5 and 6
Insertion: Scalene tubercle on the upper inner aspect of the first rib

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10
Q

Scalenus Anterior: Inn and action

A

Innervation: Anterior rami of C4, 5 and 6
Action: Ipsilateral lateral flexion of the neck

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11
Q

Scalenus medius: O and I

A

Origin: Posterior tubercles of the transverse processes of C2 to C6
Insertion: Upper aspect of the 1st rib between groove for the subclavian artery and the tubercle

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12
Q

Scalenus Medius: Inn and action

A

Innervation: Anterior rami of C3 to C7
Action: Ipsilateral lateral flexion of the neck

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13
Q

Serratus anterior: O and I

A

Origin: Lateral aspects of the upper 8 ribs
Insertion: Along the medial aspect of the inferior surface of the scapula

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14
Q

Serratus Anterior: Inn and action

A

Innervation: Long Thoracic Nerve [C5, 6 and 7]
Action: Draws the scapula forwards and rotates the scapula

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15
Q

Deltoid: O and I

A

Origin: Lateral third of clavicle, acromion and spine of the scapula
Insertion: Deltoid tubercle of the humerus

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16
Q

Deltoid: Inn and Action

A

Innervation: Axillary nerve [C5 and C6]
Action: Abducts the arm [15o to 90o]. Anterior fibers flex and medially rotates the arm. Posterior fibers extend and laterally rotate arm

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17
Q

Pectoralis Major: O and I

A

Origin: Sternum, upper 6 costal cartilages and medial half of clavicle
Insertion: Lateral lip of the bicipital groove

18
Q

Pec Major: Inn and action

A

Innervation: Medial and lateral pectoral nerves [C5, 6, 7 and C8, T1]
Action: Adducts, flex and medially rotates the arm; it also extends the flexed arm

19
Q

Supraspinatous: O and I

A

Origin: Supraspinous fossa of the scapula
Insertion: Superior facet of the greater tuberosity of the humerus

20
Q

Supraspinatous: Inn and action

A

Innervation: Suprascapular nerve [C5 and C6]
Action: Initiates abduction [0-15o] of the arm

21
Q

Infraspinatous: O and I

A

Origin: Infraspinous fossa of the scapula
Insertion: Middle facet of greater tuberosity of the humerus [just below supraspinatus insertion]

22
Q

Infraspinatous: Inn and action

A

Innervation: Suprascapular nerve [C5 and C6]
Action: Externally rotates the humerus

23
Q

Teres Major: O and I

A

Origin: Oval depression on the lateral aspect of the dorsum of the scapula above the inferior angle Insertion: Medial lip of the bicipital groove

24
Q

Teres Major: Inn and act

A

Innervation: Lower subscapular nerve [C5 and 6]
Action: Extends, adducts and medially rotates the arm

25
Q

Teres Minor: O and I

A

Origin: Middle third of the lateral border of scapula Insertion: Inferior facet of greater tuberosity of humerus [just below infraspinatus insertion]

26
Q

Teres Minor: Inn and act

A

Innervation: Axillary nerve [C5 and C6]
Action: Externally rotates the arm

27
Q

Subscapularis: O and I

A

Origin: medial two-thirds of the ventral aspect of the scapula
Insertion: Lesser tuberosity of the humerus

28
Q

Subscapularis: Inn and action

A

Innervation: Upper and lower subscapular nerves [C5 and C6]
Action: Internally rotates and adducts the arm

29
Q

Biceps Brachii: O and I

A

Origin: Coracoid process [short head] and the supraglenoid tubercle [long head]
Insertion: Posterior border of the radial tuberosity of the radius

30
Q

Biceps Brachii: Inn and action

A

Innervation: Musculocutaneous nerve [C5, 6, 7]
Action: Flexes and supinates the elbow

31
Q

Triceps: O and I

A

Origin: Infraglenoid tubercle [long head], lateral upper and medial lower parts of the humerus
Insertion: Olecranon of the ulna

32
Q

Triceps: Inn and action

A

Innervation: Radial nerve [C7 and C8]
Action: Extends the forearm and adducts the arm

33
Q

Brachioradialis: O and I

A

Origin: Upper two-thirds of the lateral supracondylar ridge of humerus
Insertion: Base of the styloid process of the radius

34
Q

Brachioradialis: Inn and action

A

Innervation: Radial nerve [C6 and C7]
Action: Flexes the forearm

35
Q

Pronator Teres: O and I

A

Origin: Medial epicondyle of the humerus and medial border of the coronoid process of ulna
Insertion: Upper part of the radius

36
Q

Pronator Teres: Inn and action

A

Innervation: Median nerve [C6 and 7] which passes between the humeral and ulnar heads
Action: Pronates the forearm and flexes the elbow

37
Q

Psoas Major: O and I

A

Origin: Bodies, intervertebral discs and transverse processes of L1-5
Insertion: Lesser trochanter of the femur

38
Q

Psoas Major: Inn and action

A

Innervation: L2, 3 and 4 from the lumbar plexus
Action: Flexes the thigh and trunk

39
Q

Gluteus Maxmus: O and I

A

Origin: Ilium, sacrum, coccyx and sacrotuberous ligament
Insertion: Gluteal tuberosity of the femur [25%] and iliotibial band [75%]

40
Q

Gluteus Maximus: Inn and action

A

Innervation: Inferior Gluteal nerve [L5, S1 and S2]
Action: Extends and externally rotates the thigh

41
Q

Piriformis: O and I

A

Origin: Pelvic [anterior] surface of sacrum Insertion Medial aspect of the superior border of the greater trochanter of the femur

Part 1 Board Exams (5 decks)

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