Skeletal Muscles Flashcards
Raises eyebrows
Wrinkles Forehead
Occipito-Frontalis
Compresses cheek “sour”
Buccinator
Elevates corner of mouth (smile)
Zygomaticus
Depresses corner of mouth (frown)
Depressor Anguli oris
Draws eyebrows toward midline
“Anger/disgust”
Corrugator supercilli
Closes eye
“Sleep/pain”
Orbicularis oculli
Closes mouth
“Kissing muscle”
Orbicularis oris
Raises and furrows upper lip
“Snarl”
Levator Labii superioris
Lowers lower lip
“Pout”
Depressor Labii inferioris
Depresses mandible
Digastric
Elevates mandible
Attaches to large salivary gland
Masseter
Elevates mandible
Attaches to temporal bone
Temporalis
Flexes Head
Part of the neck and shoulders
Sternocleidomastoid
Extends head
Part of neck and shoulders
Splendius capitus
Extends head
Moves scapula posteriors
Trapezius
Flexes arm
Extends arm
Abducts arm
Deltoid
Moves scapula anteriorly
2 muscles of the chest
Pectoralis minor
Serratus anterior
Flexes arm
Pectoralis major
Increases thoracic volume
Diaphragm
Elevates ribs
Increases thoracic volume
External intercostalis
Depresses ribs
Decreases thoracic volume
Internal intercostalis
Back muscle that:
Extends arm
Adducts arm
Lattisumus Dorsi
Muscle in the back that:
Extends trunk
Erector Spinae
Anterior part of upper arm that:
Flexes arm
Flexes forearm
Biceps brachii
Posterior muscle of upper arm that:
Extends arm
Extends forearm
Triceps brachii
Abdominal muscle that:
Flexes trunk
Decreases thoracic volume
Increases intraabdominal pressure
Rectus abdominus
Abdominal muscle that: Decreases thoracic volume Flexes trunk Increases intrabdominal pressure Superficial
External abdominal oblique
Abdominal muscle that: Decreases thoracic volume Flexes trunk Increases intrabdominal pressure Deep
Internal abdominal oblique
Abdominal muscle that:
Decreases thoracic volume
Increases intrabdominal pressure
Inside of mannequins abdomen
Transverse abdominus
What are the two muscles in the iliopsoas group?
These both flex the trunk and flex thigh.
Psoas major
Iliacus
This major butt muscle extends the thigh.
Gluteus maximus
This butt muscle abducts the thigh.
Gluteus medius
This upper leg/hip muscle adducts the thigh.
Adductors
This upperleg/hip muscle flexes and adducts the thigh.
gracilis
Name the 4 quadriceps femoris muscles and their action.
- Rectus femoris
- Vastus lateralis
- Vastus medialis
- Vastus intermedius
Extend the knee
Name the 3 muscles of the hamstring group and their action.
- Biceps femoris
- Semitendinosus
- Semimembranosus
Extend thigh and flex leg at knee
Starts at top of rectus femoris and flexes thigh. Snake like
Sartorius
This is the calf. It’s action is plantar flexion and flexes the leg.
Gastrocnemius
This is below and center to the gastrocnemius and it’s action is plantar flexion.
Soleus
This calf muscle is lateral to the tibia and is responsible for dorsiflexion.
Tibialis anterior
Visceral organs Spindle fibers 1 nucleus Non striated Involuntary
Smooth muscle tissue
Heart Y Branches 1 nucleus Striated intercalated discs Involuntary with automaticity
Cardiac muscle tissue
Muscles attach to bony skeleton Long fibers Multinucleated Striated Voluntary
Skeletal muscle tissue
