Muscles- Lab 22,23,24,25 Flashcards
Epicranius
Raises eyebrows; retracts scalp
Nasalis
Widens nostrils
Orbicularis oculi
Closes eyelids as in blinking
Orbicularis oris
Closes lips; protrudes lips as for kissing
Risorius
Draws corner of mouth laterally
Zygomaticus major
Raises corners of mouth as when smiling and laughing
Zygomaticus minor
Raises corners of mouth as in smiling and laughing
Buccinator
Compresses cheeks inward as when blowing air
Platysma
Draws angle of mouth downward as when pouting or expressing horror
Masseter
Elevates mandible
Temporalis
Elevates mandible
Lateral pterygoid
Depresses and protracts mandible and moves it from side to side as when grinding food
Medial pterygoid
Elevates mandible and moves it from side to side as when grinding food
Sternocleidomastoid
Flexion of head and neck; rotation of head to left or right
Trapezius
Extends head (as a synergist); rotates scapula; various fibers raise scapula, pulls scapula medially, or pull scapula and shoulder down
Scalenes
Elevates ribs one and two; Flexion and rotation of the neck
Splenius capitis
Extends head; rotates head
Semispinalis capitis
Extends head; rotates head
Digastric
Opens mouth; depresses mandible; elevates hyoid bone
Stylohyoid
Retracts and elevates hyoid bone
Mylohyoid
Elevates hyoid bone during swallowing
Sternohyoid
Depresses hyoid bone
Omohyoid
Depresses hyoid bone
Sternothyroid
Depresses larynx
Thyrohyoid
Depresses hyoid bone; elevates larynx
Pectoralis minor
Pulls scapula forward and downward; raises ribs
Serratus anterior
Pulls scapula anteriorly (protracts scapula)
Rhomboid major
Retracts and elevates scapula
Rhomboid minor
Retracts and elevates scapula
Levator scapulae
Elevates scapula
Pectoralis major
Flexes, adducts, and rotates arm medially
Latissimus dorsi
Flexes, adducts, and rotates arm medially
Deltoid
Abducts, extends, and flexes arm
Teres major
Extends, adducts, and rotates the arm medially
Coracobrachialis
Flexes and adducts the arm
Supraspinatus
Abducts the arm
Infraspinatus
Rotates arm laterally
Teres minor
Rotates arm laterally
Subscapularis
Rotates arm medially
Biceps brachii
Flexes elbow and supinates forearm and hand
Brachialis
Flexes elbow
Triceps brachii
Extends elbow
Brachioradialis
Flexes elbow
Anconeus
Extends elbow
Supinator
Supinates forearm and hand
Pronator teres
Pronates forearm and hand
Pronator quadratus
Pronates forearm and hand
Palmaris longus (sometimes absent)
Flexes wrist
Flexor Capri radialis
Flexes wrist and abducts hand
Flexor carpi ulnaris
Flexes wrist and adducts hand
Flexor digitorum superficialis
Flexes fingers and wrist
Flexor digitorum profundus
Flexes fingers 2-5
Flexor pollicis longus
Flexes thumb
Extensor digitorum
Extends fingers
Extensor carpi radialis brevis
Extends wrist and abducts hand
Extensor carpi ulnaris
Extends wrist and adducts hand
Extensor digiti minimi
Extends finger 5 (pinky)
Extensor pollicis longus
Extends thumb
Abductor pollicis longus
Abducts thumb
Extensor indicis
Extends finger 2 (pointer)
Extensor pollicis brevis
Extends thumb
Quadratus lumborum
Extends vertebral column; lateral flexion
Erector spinae (3 columns of muscles)
- iliocostalis
- longissimus
- spinalis
Extends vertebral column; lateral flexion
Internal oblique
Tenses abdominal wall; compresses abdominal contents; aids in trunk rotation
External oblique
Tenses abdominal wall; compresses abdominal contents; aids in trunk rotation
Rectus abdominis
Flexes vertebral column; compresses abdominal contents
Transversus abdominis
Compresses abdominal contents
coccygeus
supports pelvic viscera
Levator ani
supports pelvic viscera and provides sphincter like action in anal canal and vagina
bulbospongiosus
Males: assists emptying of urethra and assists in erection of penis
Females: constricts vagina and assists in erection of clitoris
superficial transverse perineal muscle
supports pelvic viscera
psoas major
flexes thigh at hip; flexes trunk at hip (when thigh is fixed)
Ischiocavernosus
Males: erects penis
Females: erects clitoris
Gluteus Maximus
extends thigh at hip
Iliacus
flexes thigh at hip; flexes trunk at hip (when thigh is fixed)
gluteus minimus
abducts and medially rotates thigh
gluteus medius
abducts and medially rotates thigh
piriformis
abducts and laterally rotates thigh
tensor fasciae latae
abducts and medially rotates thigh
adductor longus
adducts and flexes thigh
pectineus
adducts and flexes thigh
adductor brevis
adducts thigh
adductor magnus
adducts thigh; posterior portion extends thigh, and anterior portion flexes thigh
sartorius
flexes, abducts, and laterally rotates thigh at hip; flexes leg at knee
gracilis
adducts thigh and flexes leg at knee
vastus lateralis (quadriceps femoris group)
extends leg at knee
Rectus femoris (quadriceps femoris group)
extends leg at knee; flexes thigh at hip
vastus intermedius
extends leg at knee
vastus medialis (quadriceps femoris group)
extends leg at knee
semitendinosus (hamstring group)
flexes leg at knee; rotates leg medially; extends thigh
biceps femoris (hamstring group)
flexes leg at knee; rotates leg laterally; extends thigh
Tibialis anterior
Dorsiflexion and inversion of the foot
semimembranosus (hamstring group)
flexes leg at knee; rotates leg medially; extends thigh
Extensor hallucis longus
Extends great toe and dorsiflexion
Extensor digitorum longus
Extends toes 2-5 and dorsiflexion
Gastrocnemius
Plantar flexion of foot and flexes knee
Fibularis tertius
Dorsiflexion and eversion of foot
Plantaris
Plantar flexion of foot and flexes knee
Soleus
Plantar flexion of foot
Flexor digitorum longus
Flexes toes 2-5 and plantar flexion and inversion of the foot
Tibialis posterior
Plantar flexion and inversion of the foot
Fibularis longus
Plantar flexion and eversion; also supports arch
Flexor hallucis longus
Flexes great toe and plantar flexes foot
Extensor carpi radialis longus
Extends wrist and abducts hand
Fibularis brevis
Plantar flexion and eversion of foot