Muscular System – BI 131 Laboratory

Vocabulary flashcards covering the primary muscles discussed in the BI 131 Muscular System laboratory notes, each with its corresponding action.

Frontalis

Raises eyebrows

Orbicularis oculi

Closes eyes; the “winking muscle”

Zygomaticus (minor & major)

Raises corners of mouth; the “smiling muscle”

Buccinator

Compresses cheek

Temporalis

Closes jaw

Masseter

Closes jaw

Orbicularis oris

Purses lips; the “kissing muscle”

Mentalis

Protrudes lower lip; the “pouting muscle”

Platysma

Opens jaw

Digastric

Opens jaw

Sternocleidomastoid

Together flex neck; singly turn head

Splenius

Together extend neck; singly turn head

Pectoralis major

Flexes and adducts arm

Pectoralis minor

Draws scapula forward

Serratus anterior

Draws scapula forward; the “boxer’s muscle”

Deltoid

Abducts arm

External intercostals

Elevate ribs during inspiration

Internal intercostals

Depress ribs during forced expiration

Rectus abdominis

Flexes vertebral column

External oblique

Flexes vertebral column; rotates trunk

Internal oblique

Flexes vertebral column; rotates trunk

Transversus abdominus

Compresses abdomen

Trapezius

Extends head; stabilizes neck and shoulder

Latissimus dorsi

Adducts arm; draws arm downward

Teres major

Synergist to latissimus dorsi

Teres minor

Rotates humerus; stabilizes shoulder joint

Infraspinatus

Rotates humerus; stabilizes shoulder joint

Subscapularis

Rotates humerus; stabilizes shoulder joint

Supraspinatus

Abducts humerus; stabilizes shoulder joint

Rhomboid (major & minor)

Pull scapula medially; squares shoulders

Levator scapulae

Elevates scapula; the “shrugging muscle”

Erector spinae

Bends vertebral column laterally

Quadratus lumborum

Flexes vertebral column laterally

Triceps brachii

Extends forearm

Biceps brachii

Flexes forearm

Brachialis

Flexes forearm

Brachioradialis

Flexes forearm

Flexor carpi radialis

Wrist flexor

Palmaris longus

Wrist flexor

Flexor carpi ulnaris

Wrist flexor

Extensor carpi radialis longus

Wrist extensor

Extensor carpi radialis brevis

Wrist extensor

Extensor carpi ulnaris

Wrist extensor

Extensor digitorum

Wrist extensor

Iliopsoas

Flexes thigh

Adductors (magnus, longus, brevis)

Thigh adductors

Pectineus

Flexes and abducts thigh

Rectus femoris

Extends leg (part of quadriceps)

Vastus lateralis

Extends leg (part of quadriceps)

Vastus intermedius

Extends leg (part of quadriceps)

Vastus medialis

Extends leg (part of quadriceps)

Tensor fasciae latae

Abducts thigh

Gluteus maximus

Extends thigh

Gluteus medius

Abducts thigh

Biceps femoris

Extends thigh; flexes leg (hamstring)

Semitendinosus

Extends thigh; flexes leg (hamstring)

Semimembranosus

Extends thigh; flexes leg (hamstring)

Tibialis anterior

Dorsiflexion

Extensor digitorum longus

Dorsiflexion; extends toes

Fibularis (longus & brevis)

Plantar flexion