OAIN Flashcards
1-50 (24 cards)
What is the origin of the Anterior Deltoid?
Lateral third of clavicle
The Anterior Deltoid is primarily involved in shoulder flexion and internal rotation.
What action does the Pectoralis Major (clavicular head) perform?
Flexion (clavicular), adduction, internal rotation
This muscle is crucial for movements that involve bringing the arms toward the body.
What is the innervation of the Coracobrachialis?
Musculocutaneous nerve (C5–C7)
The Coracobrachialis assists in flexion and adduction of the arm.
What is the insertion point of the Posterior Deltoid?
Deltoid tuberosity of humerus
The Posterior Deltoid is responsible for shoulder extension and external rotation.
List the origins of the Latissimus Dorsi.
- Spinous processes T7–L5
- Thoracolumbar fascia
- Iliac crest
This muscle plays a key role in extension, adduction, and internal rotation of the shoulder.
What action does the Teres Major perform?
Extension, adduction, internal rotation
Teres Major works alongside Latissimus Dorsi for similar movements.
What is the primary action of the Triceps Brachii (long head)?
Assists extension and adduction
The Triceps Brachii is the main extensor of the elbow.
What is the origin of the Middle Deltoid?
Acromion process of scapula
The Middle Deltoid is primarily responsible for arm abduction.
What muscle initiates abduction of the arm?
Supraspinatus
This muscle also stabilizes the glenohumeral joint.
What is the innervation of the Pectoralis Major (sternal head)?
Medial & lateral pectoral nerves (C5–T1)
This muscle is involved in adduction and internal rotation of the shoulder.
What is the action of the Teres Minor?
External rotation, adduction, stabilization
Teres Minor is part of the rotator cuff.
What is the origin of the Subscapularis?
Subscapular fossa of scapula
The Subscapularis is responsible for internal rotation and stabilization of the shoulder.
What is the insertion of the Infraspinatus?
Greater tubercle of humerus
This muscle is involved in external rotation and stabilization of the shoulder.
What action does the Sternocleidomastoid perform?
Flexes neck; rotates head to opposite side
This muscle is key for head movement and neck flexion.
What is the innervation of the Anterior Scalene?
Cervical spinal nerves (C4–C6)
The Anterior Scalene elevates the 1st rib during inspiration.
What is the action of the Longus Colli?
Flexes neck, slight rotation
This muscle aids in neck stability and movement.
What is the insertion of the Rectus Capitis Anterior?
Basilar part of occipital bone
This muscle flexes the head at the atlanto-occipital joint.
What is the action of the Splenius Capitis?
Extends, rotates, and laterally flexes head
This muscle is crucial for movements of the head and neck.
What is the origin of the Middle Scalene?
Transverse processes of C2–C7
This muscle assists with lateral flexion of the neck.
What is the innervation of the Levator Scapulae?
Dorsal scapular nerve (C5); cervical nerves (C3–C4)
The Levator Scapulae elevates the scapula and assists with cervical extension.
What is the primary function of the Biceps Brachii?
Flexes elbow, supinates forearm
The Biceps Brachii is a key muscle for arm movement.
What is the origin of the Brachialis?
Distal half of anterior humerus
The Brachialis is the primary elbow flexor in all positions.
What is the action of the Triceps Brachii?
Primary elbow extensor
The Triceps Brachii is essential for extending the arm.
What is the insertion of the Supinator?
Proximal lateral radius
The Supinator is responsible for forearm supination.
