Musculoskeletal Anatomy Flashcards
Name the Components of the Axial Skeleton
Skull, Ribs, Sternum, Vertebral Column
Function of Skull
Protect
Function of Sternum
Attachment for ribs
Function of Rib Cage
Protect vital organs
Function of veterbral column
Support head, protect spinal cord, attachment point for ribs and back muscles
Function of Axial Skeleton
Protection of vital organs and support and maintenance of posture
Parts of the vertebral column from from top to bottom
Cervical, thoracic, lumbar, sacral, coccyx
How many vertebrae are in the cervical vertebrae
7
How many vertebrae are in the thoracic vertebrae
12
How many vertebrae are in the lumbar vertebrae
5
How many vertebrae are in the sacral
5 (fused)
How many vertebrae are in the coccyx
4 (fused)
Name the parts of the pectoral girdle (Appendicular Skeleton)
Clavicle and Scapula
Name the bones of the arm (appendicular skeleton)
humerus, radius, ulna, carpals, metacarpals, phalanges
Name the bones of the pelvic girdle
Ilium, ischium, pubis
Name the bones of the leg (appendicular skeleton)
femur, patella, fibula, tibia, tarsals, metatarsals, phalanges
Component of Long Bones
Length is greater than width, for movement
Components of short bones
small and cube shaped
Components of flat bones
Curved surfaces, for protection, and provides a broad area for muscle attachment
Components of Irregular Bones
Specialized shape and function
Example of Long Bones
femur, tibia, fibula, humerus, radius, ulna, metacarpals, metatarsals, and phalanges
Examples of short bones
carpals and tarsals
Example of flat bones
sternum, scapula, ribs, pelvis
Example of irregular bones
vertebrae, sacrum, coccyx
What is the epiphysis on a long bone?
Head of the long bones, made of spongy bone, contains red bone marrow
What is the diaphysis on the long bone?
length or shaft of the long bone, made of compact bone, for protection and support
What is articular cartilage?
On the ends of the long bone, reduces friction, absorbs shock
What is spongy bone (cancellous)?
Located inside epiphysis, very porous, provides structural support and stability
What is compact bone?
What diaphysis is made of, very dense, great strength and rigidity
What is yellow bone marrow?
Inside the medullary (marrow) cavity, made mostly of fat, contains stem cells for cartilage, fat, and bone cells
What is red bone marrow?
Located in the epiphysis, contains stem cells that can become blood cells/platelets
What is the medullary cavity?
also the marrow cavity, stores yellow bone marrow
What do blood vessels do in the bone?
Supply blood and nutrients to the bone
What is the periosteum
outer lining of the bone, for bone growth and repair, attachment of ligaments and tendons
Name all the components of the long bone
Epiphysis, diaphysis, articular cartilage, spongy bone, compact bone, yellow bone marrow, red bone marrow, medullary cavity, blood vessel, periosteum
Inferior
Below
Superior
Above
Proximal
closer to the center or where a limb attaches to the body
Distal
Further away from the center or where the limb attaches to the body
Medial
Closer to the midline of the body
Lateral
Further from the midline of the body
Posterior
Back
Anterior
Front
What is a ligament?
Connective tissue that connects bone to bone
What is a tendon?
Connective tissue that connects muscle to bone
What is cartilage?
Reduces friction, absorbs shock, and protects bone
What is a joint?
Where two or more bones come into contact or articulate with each other
What is a fibrous joint?
thin layer of fibrous tissue that connects edges of two bones, no movement allowed
What is an example of a fibrous joint?
Sutures of the skull
What is a cartilaginous joint?
joined by cartilage, limited movement
What is an example of a cartilaginous joint?
Between vertebrae and between ribs and sternum
What is a synovial joint?
Freely moving join that contain synovial fluid in a cavity around articulating bones, most important for mobility
What is an example of a synovial joint?
elbow, knee
Name parts of a synovial joint
articular cartilage, articular capsule, synovial membrane, synovial fluid, bursae, meniscus
What is the articular capsule?
Sleeve like structure that surrounds the joint under the bursae
What is the synovial membrane?
Line the capsule and secretes synovial fluid
What is synovial fluid?
lubricates articular cartilage preventing friction damage during movement
What is the bursae?
fluid filled sac that works as a cushion to reduce friction
What is the meniscus?
Discs of fibrocartilage that provide cushioning and stability
What is a condyloid joint?
One bone is oval and fits with a concave surface. Movement only in two directions (side/side, up/down)
Example of condyloid joint?
Wrist
What is a saddle joint?
Saddle and rider, movement in two directions (up/down, side/side)
What is an example of a saddle joint?
Thumb
What is a ball and socket joint?
sphere fits into round cavity, movement in all directions
What is an example of a ball and socket joint?
shoulder, hip
What is a hinge joint?
Convex bone fits with a concave bone, can flex/extend in one direction
What is an example of a hinge joint?
elbow, knee
What is a pivot joint?
One bone forms a ring in which the other bone rotates, allows rotation
What is an example of a pivot joint?
radius and ulna, neck
What is a gliding joint?
Bones that are mostly flat and glide across each other, least movement
What is an example of a gliding joint?
Between carpal and tarsal bones
What are the three types of muscle?
Smooth, cardiac, skeletal
What is skeletal muscle?
under voluntary control, striated appearance, tendons that attaches mostly to bone, main function is movement
What is cardiac/heart muscle?
striated, involuntary
What is smooth muscle?
lines wall of blood vessels and hollow organs, involuntary, not striated
What are striations?
Tissue that converts energy
What are the main functions of muscle?
movement, move substances, stabilize and maintain body position, body heat
What are the properties of muscle tissue?
contractility, extensibility, elasticity
What are the 3 layers of fascia?
Epimysium, perimysium, endomysium
What is epimysium?
Outer layer which covers entire muscle
What is perimysium?
surrounds bundle of muscle fiber
what is endomysium?
layer of fascia that surrounds individual muscle fiber
What is muscle fiber?
Consist of a single muscle cell that helps control the physical forces of the body
What is myofibril?
light and dark bands arranged in a series of function units
What is a sarcomere?
contain bands of contractile proteins (actin and myosin) that are important for muscle contraction
Hypertrophy?
increase of myofibrils, bigger muscle
Atrophy?
Decrease of myofibrils, smaller muscle
Rectus abdominus?
most superficial, pubis to rib and sternum, “six pack”
External obliques?
lower 8 ribs to ilium, side of torso, sideways bending movement and rotation
Erector spinae?
runs alongside most of spine
Deltoid?
shoulder muscle, posterior scapula and anterior clavicle to lateral humerus
Pectoralis major?
covers entire anterior chest, “peck”
Biceps brachii
entire upper arm, scapula to radius and ulna
Trapezius?
triangular shape, posterior neck and upper back, raise shoulder
Latissimus dorsi?
sides of back muscle, sacrum and ilium to humerus, brings arms backwards
Triceps brachii
Posterior upper arm, shoulder and elbow movement, back of bicep
Iliopsoas?
lumbar vertebrae and ilium to inner femur, hips
Sartorius?
longest muscle in the body, ilium to medial tibia, knee thigh movement, inner thigh muscle
What are the four muscles of the quadriceps?
rectus femoris, vastus lateralis, vastus medialis, vastus intermedius
Rectus femoris?
superficial middle thigh muscle
Vastus lateralis?
outside thigh muscle
Vastus medialis?
inside thigh muscle
Vastus intermedius
middle thigh muscle under rectus femoris
Tibialis anterior?
front of lower leg, between tibia and fibula, walking/running
Gluteus maximus?
butt, sacrum, ilium, coccyx to upper lateral femur
What are the muscles of the hamstrings?
biceps femoris, semitendinosus, semimembranosus (all on back thigh)
Biceps femoris?
outside nearest to hip, head of fibula
semitendinosus?
inside, superficial, back thigh
semimembranosus?
inside, under semitendinosus
Parts of calf muscle
gastrocnemius, soleus
Gastrocnemius?
most superficial, two heads
Soleus?
underneath gastrocnemius
What is the longest bone in the body?
Femur
What factors affect the stability of a joint?
shape, whether the bones interlock, area over which the bones contact, flexibility of ligaments, influence of other soft tissue
What gives muscle a striated appearance?
Repeating bands of actin and myosin