Muscles of the Back Flashcards

Iliac fossa
Terms Definitions
BREVIS
Short
ton-
tone tension
hypoglossus
depresses tongue
Smooth Muscle
 
voluntary?
striated?
# of nuclei?
innervation?
involuntary
non-straited
single nuclei
not necessary for function
Iliacus (Origin)
Iliac Fossa
mylohyoid
elevates hyoid bone
adduction
adductor longus action
masseter muscles
chewing muscles
Masseter
Origin:  Zygomatic archInsertion:  Lateral surface of mandibular ramus and angleAction:  Elevation of the mandible, with smaller roles in protraction, retraction, and lateral and medial excursionInnervation:  Facial n.
Vastus lateralis (Quads)
most lateral
Origins of Semitendinosus
ischial tuberosity
suprapatellar bursa
articulis genu insertion
semimembranosus
flexes leg, extends thigh
glutes
Gluteus maximus, medius, minimus
aponeuroses
flat sheets of tendon
Extensor Hallucis
Extend Big Toe, Dorsiflexion
Piriformis (Origin)
Anterior Surface of Sacrum
pectoralis major
flexes and adducts arm
Biceps Brachii
Origin: Humerus, Scapula
Insertion: Radius
Action: Flexes, Supinates Forearm
Brachioradialis
synergistic muscle (along with brachialis) whose belly is entirely over the anterior surface of the forearm
 
thick, fleshy muscle mass on the lateral surface of the antebrachium
 
O: distal end of humerus
I: distal end of radius
Masseter
closes jaw by elevating mandible
sciatic n/ tibial branch
semimembranous innervation
Any disease of the muscles
myopathy
Trapezius
Origin: Occipital boneInsertion: Spine & acromion of scapulaAction: Stabilizes, rotates, raises, elevates scapulaScapular
fascicle
bundle of muscle cells (10-100)
gluteus maximus
extends and laterally rotates thigh
Thigh Adduction
Pectineus; Adductor Longus; Adductor Magnus; Gracilis
Vastus intermedius
Origin:  Anterior and lateral surfaces of femoral shaftInsertion:  Patella, tibial tuberosity, lateral and medial condyles of tibiaAction:  Extends knee
Plantaris (Origin)
Lateral supracondylar ridge of femur
Psoas major
 
Origin
Insertion
Action
Origin: T12 - L5 vertebrae
 
Insertion: Lesser trochanter of femur
 
Action: Flexes thigh
 
 
EXTENSOR DIGITI MINIMUS
a222. A- extends pinky
extensor carpi ulnaris
extends and adducts wrist
Myogram
A graphic recording of mechanical contractile activity produced by an apparatus that measures muscle contractions.
Accessory nerve
Innvervates trapezius, if injured, patient cannot raise the tip of shoulder
cardiac muscle
intermediate between smooth and skeletal muscle structurally and functionally
flexor carpi radialis
flexes and abducts wrist
Rectus abdominus
Origin: pubic crestInsertion: Xiphoid processAction: childbirthTrunk
Insertion of Gastrocnemius
calcaneus via Achilles tendon
deltoids
a large, triangular muscle covering the joint of the shoulder, the action of which raises the arm away from the side of the body.
Inside the perimysium are bundles of muscle fibres called _____________.
fascicles
Teres Major
Extend Arm; Adduct Arm; Medial Rotation of Arm
Digastric: Anterior Belly (Action)
Elevates hyoid, depresses mandible
Latissimus dorsi
 
Action
Extends, adducts, and medially rotates arm
 
 draws arm inferiorly and posteriorly
(swimming, climbing rope, hammering)
 
 
EXTENSOR DIGITORUM (COMMUNIS)
a17. O- lateral epicondyle
 
I- digits 2-5
 
A- extends wrist and digits 2-5
Transversus abdominus
fibers are horizontal; most internal layer of the four
Action of Sternocleidomastoid
Flexes and laterally rotates head
Serratus Anterior
Origin: Lateral part of ribs 1-8Insertion: Vertebral border of anterior surface of scapulaAction:Moves scapula forward toward chest; rotates scapula; abduction & raising of arm
plantar flextion REGARDLESS OF KNEE POSITION (doesn't cross knee joint)
soleus action
caveolae
what does smooth muscle have instead of T tubules/sarcoplasmic reticulum?
Costal cartilage
A bladelike plate of hyaline cartilage that attaches the distal end of a rib to the sternum is referred to as the costal cartilage.
Elevates and retracts hyoid bone
Stylohyoid* - VII
Semimembranosus
O: the ischial tuberosity of the ischiumI: the medial condyle of the tibiaN: The tibial nerve
Insertion of Biceps Brachii
radial tuberosity; biciptal aponeurosis
frontalis
fron of the epicranius; muscle that raises the eye brows, draws the scalp forward
 
 
 
Soleus
Origin: head and shaft of fibula and posterior surface of tibia
 
Insertion: Posterior surface of calcaneus
 
Action: Plantar flexion of foot
Extensor Carpi Radialis Brevis (Insertion)
Base of Metacarpal 3
DEPRESSOR ANGULI ORIS
ORIGIN- MANDIBLEINSERT- LOWER LIP NEAR ANGLEFUNCTION- DEPRESSES ANGLE OF LIP
tensor facia latae
located anterior to gluteus medius; tenses thigh & functions to abduct & flexes thigh & rotates it medially
Scalenes
three muscles on each side of the neck
 
comes out and behind the trapezius in an oblique angle and help us to turn our head from side to side
Biceps Brachii (Short Head)
Origin: Coracoid process of scapulaInsertion: radial tuberosityAction: flexion of elbow & supination of forearm
flexus lateral 4 toes (2-5)
flexor digitorum brevis action
sodium
when an neuron is stimulated, what ion rushes into the neuron?
Prime mover
Muscle that is mainly responsible for a particular body movement is a prime mover.
Internal intercostals
O:Superior border of a rib I:inferior border of the previous rib A:depress the ribs
risorius
muscles of the mouth that draws the corner of the mouth out and back, as in grinning
hypertrophy
an increase in mass or girth, of a muscle can be induced by a number of stimuli. the most familiar is exercise.
Triceps brachii - Lateral head
 
Origin
Insertion
Action
Origin: Posterior shaft of humerus
 
Insertion: Olecranon process of ulna
 
Action: Extends forearm
Inguinal Ligament
inferior margin of the trunk and forms a strong, cord-like structure between the anterior spine of the ilium and the pubis
 
also forms the superior margin of the femoral triangle
what is an axon?
long, threadlike extensions of the neuron (nerve fiber)
nerve to obturator internus (S1, S2, S3)
gemellus superior innervation
Triceps brachiiaction: extends forearm at elbow
origin: Tubercle below glenoid cavity and lateral and medial surfaces of humerusinsertion: Olecranon process of ulna
Iliacus
O: The Iliac Fossa of the IliumI: The Lesser Trochanter of the FemurN: The Femoral Nerve
biceps
a biceps muscle, esp. the one at the front of the upper arm.
Gluteus medius and gluteus minimus
Origin:  Most of lateral surface of ilium between crest and acetabulumInsertion:  Greater trochanter of femurAction:  Abduct and medially rotate thigh; during walking, shift weight of trunk toward limb with foot on the ground as other foot is lifted
what are skeletal muscles?
muscles that attach to the body's skeleton
multi unit (phase smooth muscle)
smooth muscle fibers that contract individual muscle fibers independentlyex: ciliary body of iris, erector pili musc.
Extensor digitorum brevis
O: The calcaneusI: the tendons of the extensor digitorum longus to the 2nd, 3rd, and 4th toesN: the deep peroneal nerve
Lee The Baker Took The Muffins
Ligaments To Bone Tendons To Muscles
Serratus Posterior Superior Insertion (1)
upper borders of the second, third, fourth, and fifth ribs
what are the filament light and dark band called? striations form a repeating patteren that is indicative of skeletal muscle functional unit we call?
1. striations 2. sarcomeres
What are two landmarks to identifying whether a tibia is a right or a left tibia?
MED. MALLEOLUS, on the medial side;and
TIBIAL TUBEROSITY 
what gives muscles their striped appearance?
the alternating light (I) and dark (A) bands along the length of the perfectly aligned myofibrils
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