OIA of Muscles

Origin, insertion, & action - lab practical 2

What is the origin of Temporalis?

Temporal fossa

What is the insertion of Temporalis?

Coronoid process of mandible

What is the action of Temporalis?

Elevation and retraction of mandible

What is the origin of Masseter?

Zygomatic arch

What is the insertion of Masseter?

Ramus and angle of mandible

What is the action of Masseter?

Elevation of mandible

What is the origin of Medial pterygoid?

Sphenoid and palatine bones; maxilla

What is the insertion of Medial pterygoid?

Medial angle of mandible

What is the action of Medial pterygoid?

Elevation and protraction of mandible

What is the origin of Lateral pterygoid?

Sphenoid bone

What is the insertion of Lateral pterygoid?

Neck of mandible and TMJ disc/capsule

What is the action of Lateral pterygoid?

Protraction and depression of mandible

What is the origin of Mylohyoid?

Mandible

What is the insertion of Mylohyoid?

Hyoid bone

What is the action of Mylohyoid?

Elevation of hyoid; assists depression of mandible

What is the origin of Omohyoid?

Scapula

What is the insertion of Omohyoid?

Hyoid bone

What is the action of Omohyoid?

Depression of hyoid

What is the origin of Sternocleidomastoid?

Sternum and clavicle

What is the insertion of Sternocleidomastoid?

Mastoid process of temporal bone

What is the action of Sternocleidomastoid?

Flexion, lateral flexion, and opposite-side rotation of neck

What is the origin of Splenius capitis?

Spinous processes C7–T3/T4

What is the insertion of Splenius capitis?

Mastoid process and occipital bone

What is the action of Splenius capitis?

Extension, lateral flexion, and same-side rotation of head

What is the origin of Quadratus lumborum?

Iliac crest

What is the insertion of Quadratus lumborum?

12th rib and transverse processes L1–L4

What is the action of Quadratus lumborum?

Lateral flexion and extension of vertebral column

What is the origin of Deltoid?

Clavicle, acromion, and scapula

What is the insertion of Deltoid?

Deltoid tuberosity of humerus

What is the action of Deltoid?

Abduction; also flexion, extension, internal and external rotation of arm

What is the origin of Pectoralis major?

Clavicle, sternum, and costal cartilages

What is the insertion of Pectoralis major?

Lateral lip of intertubercular sulcus of humerus

What is the action of Pectoralis major?

Flexion, adduction, and internal rotation of arm

What is the origin of Pectoralis minor?

Ribs 3–5

What is the insertion of Pectoralis minor?

Coracoid process of scapula

What is the action of Pectoralis minor?

Depression and protraction of scapula

What is the origin of Supraspinatus?

Supraspinous fossa of scapula

What is the insertion of Supraspinatus?

Greater tubercle of humerus

What is the action of Supraspinatus?

Abduction of arm

What is the origin of Infraspinatus?

Infraspinous fossa of scapula

What is the insertion of Infraspinatus?

Greater tubercle of humerus

What is the action of Infraspinatus?

External rotation of arm

What is the origin of Teres minor?

Lateral border of scapula

What is the insertion of Teres minor?

Greater tubercle of humerus

What is the action of Teres minor?

External rotation of arm

What is the origin of Subscapularis?

Subscapular fossa

What is the insertion of Subscapularis?

Lesser tubercle of humerus

What is the action of Subscapularis?

Internal rotation of arm

What is the origin of Coracobrachialis?

Coracoid process of scapula

What is the insertion of Coracobrachialis?

Medial shaft of humerus

What is the action of Coracobrachialis?

Flexion and adduction of arm

What is the origin of Biceps brachii — long head?

Supraglenoid tubercle of scapula

What is the insertion of Biceps brachii — long head?

Radial tuberosity

What is the action of Biceps brachii — long head?

Flexion of elbow and supination of forearm

What is the origin of Biceps brachii — short head?

Coracoid process of scapula

What is the insertion of Biceps brachii — short head?

Radial tuberosity

What is the action of Biceps brachii — short head?

Flexion of elbow and supination of forearm

What is the origin of Brachialis?

Anterior humerus

What is the insertion of Brachialis?

Coronoid process and tuberosity of ulna

What is the action of Brachialis?

Flexion of elbow

What is the origin of Brachioradialis?

Humerus

What is the insertion of Brachioradialis?

Styloid process of radius

What is the action of Brachioradialis?

Flexion of elbow

What is the origin of Triceps brachii — long head?

Infraglenoid tubercle of scapula

What is the insertion of Triceps brachii — long head?

Olecranon of ulna

What is the action of Triceps brachii — long head?

Extension of elbow; extension and adduction of arm

What is the origin of Triceps brachii — lateral head?

Posterior humerus above radial groove

What is the insertion of Triceps brachii — lateral head?

Olecranon of ulna

What is the action of Triceps brachii — lateral head?

Extension of elbow

What is the origin of Triceps brachii — medial head?

Posterior humerus below radial groove

What is the insertion of Triceps brachii — medial head?

Olecranon of ulna

What is the action of Triceps brachii — medial head?

Extension of elbow

What is the origin of Flexor carpi radialis?

Medial epicondyle of humerus

What is the insertion of Flexor carpi radialis?

Bases of metacarpals 2–3

What is the action of Flexor carpi radialis?

Flexion and abduction of wrist

What is the origin of Flexor carpi ulnaris?

Medial epicondyle of humerus and ulna

What is the insertion of Flexor carpi ulnaris?

Pisiform, hamate, and 5th metacarpal

What is the action of Flexor carpi ulnaris?

Flexion and adduction of wrist

What is the origin of Flexor digitorum superficialis?

Medial epicondyle, ulna, and radius

What is the insertion of Flexor digitorum superficialis?

Middle phalanges of digits 2–5

What is the action of Flexor digitorum superficialis?

Flexion of fingers 2–5

What is the origin of Flexor digitorum profundus?

Anterior ulna and interosseous membrane

What is the insertion of Flexor digitorum profundus?

Distal phalanges of digits 2–5

What is the action of Flexor digitorum profundus?

Flexion of fingers 2–5

What is the origin of Extensor carpi radialis longus?

Lateral supracondylar ridge of humerus

What is the insertion of Extensor carpi radialis longus?

Base of 2nd metacarpal

What is the action of Extensor carpi radialis longus?

Extension and abduction of wrist

What is the origin of Extensor carpi radialis brevis?

Lateral epicondyle of humerus

What is the insertion of Extensor carpi radialis brevis?

Base of 3rd metacarpal

What is the action of Extensor carpi radialis brevis?

Extension and abduction of wrist

What is the origin of Extensor digitorum?

Lateral epicondyle of humerus

What is the insertion of Extensor digitorum?

Extensor expansions of digits 2–5

What is the action of Extensor digitorum?

Extension of fingers 2–5

What is the origin of Extensor carpi ulnaris?

Lateral epicondyle of humerus and posterior ulna

What is the insertion of Extensor carpi ulnaris?

Base of 5th metacarpal

What is the action of Extensor carpi ulnaris?

Extension and adduction of wrist

What is the origin of Gluteus maximus?

Ilium, sacrum, and coccyx

What is the insertion of Gluteus maximus?

Iliotibial tract and gluteal tuberosity of femur

What is the action of Gluteus maximus?

Extension and external rotation of thigh

What is the origin of Gluteus medius?

Lateral surface of ilium