General Anatomy/Muscular System

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  • Provides movement for the body
  • Helps create heat

Vertebral Column

The inferior and superior vertebral notches of two disks form the intevertebral foramen through which spinal nerves pass.

C1 Atlas: Has transverse processes on each side with an anterior tubercle process at the back. On the Articular facet, the occipital condyles move. Lateral are the transverse foramens which houses the vertebral artery

C2 Axis: Has another pair of articular facets lateral to a Dens, odontoid process which projects upwards into the atlas. The transverse ligament run across this to keep it in place.

Spinal Vertebrae: Costal facet is posterior to the transverse costal facet (costal=rib)

Lumbar vertebrae: No costal facets, doesn't carry ribs

Upper extremities: 60 bones: humerus, radius, ulna, carpals, metaparpals, phalanges

Pelvic Girdle 2 ossa coxa each os coxa = three fused bones

Lower extremeties: 60 bones: femur, tibia, fibula, patella, tarsals, metatarsals, phalanges (sing. phalanx)

Iliopsoas (2 parts)

   Iliacus Origin: Iliac Fossa, Insertion: Lesser trcanter femur, Function: Hip, medial rotation of femur.
   Psoas major Origin: Vertebra, Insertion: " ", Function: " "

Tensor Fasciae Latae Insertion: Origin: Iliac Crest, Insertion: Tibia, lat. condyle, Hip flexor muscle.

Gluteus maximus Origin: Ilium and sacrum, Insertion: Femur, Function: Abduction and lateral rotation.

Gluteus minimus, medius Origin: Ilium, Insertion: Greater Trochanter femur, Function: Abduction, medial rotation.

Adductor longus Pubis, femur, adduct femur

Gracilus Pubis, tibia, adduct femur

Quadriceps Rectus femoris: Ilium, Tibia, knee extension Vastus lateralis: Femur, Tibia, knee extension V. medialis: Femur, Tibia, knee extension V. Intermedius: Femur, Tibia, knee extension

Sartorius: Ilium, Tibia medial, Flexes knee.

Foot Gastrocnemius Femur, Calcaneous, Plantar Flexion

Soleus Tibia and fibula, calcaneous, plantar flexion

Tibialis anterior Tibia, Metatarsal 1, med. cuneiform, Dorsal flexion

Skeletal muscles: striated, multinucleated Epi, peri, endo mysium

Muscle fiber Saredemma: transverse Tubules Sarcoplasm: myofibrils, glycogen myoglobin (binds O2)

Myofibrils are organelles composed of chains of proteins called filaments. Myofilaments: filaments in the myofibrils

A triad of transverse structures around the bands of muscle. Transverse cisternae one the sides and tubule going down the middle

Actin: Rounded spiral protein Tropomyosin: wraps around the actin Troponin complex ball sitting ontop of tropomyosin Myosin: protein bands that attract actin