Muscle Quiz 1 Flashcards
Sternocleidomastoid Origin
- Manubrium
- Medial portion of the clavicle
Sternocleidomastoid Insertion
- Mastoid process of the temporal bone
- Superior nuchal line of the occipital bone
Sternocleidomastoid Action
- Causes flexion of neck forward
- Rotates head toward shoulder on opposite side
Splenius Capitis and Cervicis Origin
- Ligamentum nuchae
- Spinous processes of C7-T6
Splenius Capitis and Cervicis Insertion
- Mastoid process
- Occipital bone
- Transverse process of C2-C4
Splenius Capitis and Cervicis Action
Extend or hyperextend head
Trapezius Origin
- Occipital bone
- Ligamentum nuchae
- Spines of C7 and all thoracic vertebrae
Trapezius Insertion
- Acromion and spinous process of scapula
- Lateral third of clavicle
Trapezius Action
-Raises, rotates and adducts scapula and stabilizes it
Pectoralis Minor Origin
-Anterior surface of ribs 3-5 near their costal cartilage
Pectoralis Minor Insertion
-Coracoid process of scapula
Pectoralis Minor Action
-With ribs fixed, draws scapula forward and inferiorly
Deltoid Origin
- Lateral third of the clavicle
- Acromion and spine of scapula
Deltoid Insertion
-Deltoid tuberosity of Humerus
Deltoid Action
-Acting as a whole, prime mover of arm abduction
Pectoralis Major Origin
- Clavicle
- Sternum
- Cartilage of ribs 1-6
- Aponeurosis of external oblique muscle
Pectoralis Major Insertion
-Fibers converge to insert by short tendon into intertubercular sulcus of Humerus
Pectoralis Major Action
-Prime mover of arm flexion; adducts, medially rotates arm
Latissimus Dorsi Origin
- Attachment to spinous process of lower thoracic vertebrae
- Last 3-4 ribs
- Illiac crest
Latissimus Dorsi Insertion
-Floor of intertubercular sulcus of humerus
Latissimus Dorsi Action
-Prime mover of arm extension; abducts and medially rotates arm
Biceps Brachii Origin
- Short head-Coracoid process
- Long head-Runs in intertubercular sulcus and within capsule of shoulder joint
Biceps Brachii Insertion
Radial tuberosity
Biceps Brachii Action
-Flexion of elbow and supination of forearm
Brachialis Origin
-Distal portion of anterior Humerus
Brachialis Insertion
-Coranoid process of ulna
Brachialis Action
-Major flexor of forearm
Triceps Brachii Origin
- Long head-inferior margin of glenoid cavity
- Lateral head-posterior humerus
- Medial head-distal radial groove on posterior humerus
Triceps Brachii Insertion
-Olecranon process of ulna
Triceps Brachii Action
-Powerful forearm extensor
Brachioradialis Origin
-Lateral supracondylar ridge of humerus
Brachioradialis Insertion
-Styloid process of radius
Brachioradialis Action
-Flexes forearm at elbow
Flexor Carpi Radialis Origin
-Medial epicondyle of humerus
Flexor Carpi Radialis Insertion
-Bases of second and third metacarpals
Flexor Carpi Radialis Action
-Flexes and radial abducts hand at wrist
Flexor Carpi Ulnaris Origin
-Medial epicondyle of humerus
Flexor Carpi Ulnaris Insertion
-Pisiform, hook of hamate and base of 5th metacarpal
Flexor Carpi Ulnaris Action
Flexes and ulnar adducts hand at wrist
Extensor Carpi Radialis Longus Origin
-Lateral supracondylar ridge of humerus
Extensor Carpi Radialis Longus Insertion
-base of metacarpal 2
Extensor Carpi Radialis Longus Action
-Extends and abducts wrist
Extensor Carpi Radialis Brevis Origin
Lateral epicondyle of humerus
Extensor Carpi Radialis Brevis Insertion
-Base of metacarpal 3
Extensor Carpi Radialis Brevis Action
-Extends and abducts wrist
Extensor Carpi Ulnaris Origin
-Lateral epicondyle of humerus
Extensor Carpi Ulnaris Insertion
Base of 5th metacarpal (dorsal)
Extensor Carpi Ulnaris Action
-Extends and ulnar adducts hand at wrist
Flexor Digitorum Superficialis Origin
-Medial epicondyle of humerus and coronoid process of ulna (Upper anterior surface of radius
Flexor Digitorum Superficialis Insertion
-Middle phalanges of digits 2-5
Flexor Digitorum Superficialis Action
-Flexes middle phalanges also flexes proximal phalanges hand at wrist and forearm at elbow
Flexor Digitorum Profundis Origin
-Anteromedial surface of ulna. Interosseous membrane
Flexor Digitorum Profundis Insertion
-Distal phalanges of fingers 2-5
Flexor Digitorum Profundis Action
-Flexes distal phalanges
Extensor Digitorum Origin
-Lateral epicondyle of humerus
Extensor Digitorum Insertion
-Distal phalanges 2-5
Extensor Digitorum Action
-Extends wrist and fingers (middle of digits 2-5)
Diaphragm Origin
- Inferior border of ribs and sternum
- Costal cartilages of last six ribs and lumbar vertebra
Diaphragm Insertion
-Central tendon
Diaphragm Action
-Prime mover of inspiration flattens on contraction
External Intercostals Origin
-Inferior border of rib above
External Intercostals Insertion
-Superior border of rib below
External Intercostals Action
-Pull ribs toward one another to elevate rib cage
Internal Intercostals Origin
-Superior border of rib below
Internal Intercostals Insertion
-Inferior border of rib above
Internal Intercostals Action
-Draw ribs together to depress rib cage
External Oblique Origin
-External surfaces of ribs 5-12
External Oblique Insertion
-Anterior illiac crest and abdominal aponeurosis to linea alba
External Oblique Action
-Flexes vertebral column, rotates vertebral column, laterally flexes vertebral column
Internal Oblique Origin
-Anterior iliac crest, lateral half of inguinal ligament and thoracolumbar fascia
Internal Oblique Insertion
-Costal cartilages of ribs 8-12; abdominal aponeurosis to linea alba
Internal Oblique Action
-Flexes vertebral column, rotates vertebral column, laterally flexes vertebral column
Transverse Abdominus Origin
-Anterior iliac crest, lateral half of inguinal ligament, thoracolumbar fascia and cartilages of ribs 6-12
Transverse Abdominus Insertion
-Abdominal aponeurosis to linea alba, xiphoid process and pubic symphysis
Transverse Abdominus Action
-Compresses abdomen
Rectus Abdominus Origin
-Pubic crest and symphysis pubis
Rectus Abdominus Insertion
-Costal cartilages of ribs 5-7, xiphoid process of sternum
Rectus Abdominus Action
-Flexes vertebral column; compresses abdomen
