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Chapter 6 muscles

Chapter 6

question answer
Occipitofrontalis raise of the eyebrow
Orbicularis closes the eyelids and causes "crows feet" wrinkles in the skin at the lateral corner of the eye.
Orbicularis oris puckers the lips
Buccinator flattens the cheeks
Orbicularis and buccinator kissing lips
Zygomaticus smiling muscles
Levator labii superioris sneering
Depressor anguli oris frowning
Muscles of the Head and neck facial muscles
Mastication chewing
How many pairs mastication muscles ? four
How many pair of pterygoids? two
Intrinsic tongue muscles change the shape of the tongue
Extrinsic Tongue muscles move the tongue
Sternocleidomastoid lateral neck muscle and prime mover
Platysma sheetlike muscle that covers the anterolateral neck
Erector spine group of muscles on each side of the back.
Responsibility of erector spine keeping back straight and body erect
Thoracic Muscle mucsles that move the thorax
Most involved in breathing External intercostals and Internal intercostals
External intercostals elevate the ribs during inspiration
Internal intercostals contract during forced expiration
Diaphragm accomplishes quiet breathing
Diaphragm shape Dome-shape muscle
Abdominal wall muscle flex and rotate the vertebral column, compress the abdominal cavity, hold in the abdominal viscera
Linea alba the tendinous area of the abdominal wall
What does the Linea alba consist of ? white connective tissue rather than muscle
Tendinous inscriptions Crosses the rectus abdominis at three or more locations
Scapular Movement Trapezius, Serratus Anterior
Trapezius Rotates scapula
Serratus Anterior pulls scapula anteriorly
Arm Movement Pectoralis major, Latissimus dorsi, Deltoid muscle
what is the arm attacked to? Attached to thorax
Pectoralis Major adducts and flexes arm
Latissimus Doris Medially rotates, adducts, powerfully extends the arm,
Swimmer Muscles Latissimus Doris
Deltoid Attaches the humerus to the scapula and clavicle. major abductor of Upper Limb
Forearm Movement Triceps Brachii, Biceps Brachii, Brachialis, Brachioradialis
Triceps Brachii Extends the forearm, Occupies the Posterior compartment of the arm
Biceps Brachii Flexes the forearm, Occupies the anterior compartment of arm
Brachialis Flexes forarm
Broachioradialis Flexes and supinates the forearm
Wrist Movement Flexor, Extensor Carpi
Fingers Movement Flexor, Extensor digitorum
Flexor Carpi Flexes the wrist
Externsor Carpi Extends the wrist
Flexor Digitorum Flexes the fingers
Extends Digitorum Extends the fingers
How many hand Muscles 19
Intrinsic Hands Muscles Hand muscles
Interossi Muscles located between metacarpals, respondible for abduction and adduction of the fingers
Thigh Movement Gluteus maximus, Gluteus Medius
Gluteus Maximus Buttocks, Contributes most of the mass
Gluteus Medius Hip muscles and common injection site.
Leg movement Quadriceps femoris, Sartorius, Hamstring muscles
Quadriceps femoris extends the leg, anterior thigh muscle
Sartorius Tailors Muscle, flexes thigh
Hamstring Muscle Posterior thigh muscle, flexes the leg and extends the thigh
Gastrocnemius and soleus form the calf muscles
Calcaneal tendon flex the foot and toes
Achilles tendons Calcaneal tendons
Peroneus Muscle The lateral muscles of the leg
intrinsic foot muscle flex extends, abduct, adduct the toes
20 muscles located with the foot Intrinsic foot muscles
4 major Functions Contractility, Excitablilty, Extensibility, Elasticity
Contractility Ability of skeletal muscle to shorten with force
Excitability Capacity of skeletal muscle to respond to a stimulus
Extensibility Ability to stretched
Elasticity recoil to their original resting length after they have been stretched
Epimysium Each skeletal muscle is surrounded by connective tissue sheath
Fascia Connective tissue located outside Epimysium, surrounds and separates muscles.
Permiysium surrounded by loose connective tissue
Fibers Fasciculi are composed of single muscles
Endomysium Each fiber is surrounded by connective tissue sheath
cytoplasm of each fiber Myofibrils
Myofibrils threadlike structure that extends from one end of the fiber to the other.
Actin Myofilaments thin, 2 minutes strands of pearls twisted together
Myosin thick, bundles of minute golf clubs
Sacomeres Actin and myosin myofilaments form highly ordered units
Resting membrane potential outside of most cell membranes is positively charged, inside of the cell membrane, negatively charged.
Motor neurons nerve cells carry actin potentials to skeletal muscle fibers
Muscle Twitch contraction of an entire muscle in response to a simulus that causes the actin potential in one or more muscle fibers
3 phases lag, contraction, relaxation
Lag Phase beginning of a contraction
Contraction Phase time of contraction
Relaxation Phase time during which the muscle relaxes
Created by: 890030550