Skeletal Systems III: Appendicular Skeleton Flashcards
appendicular muscles general components
bones of the shoulder, hip, and the limbs that attach to each
the appendicular muscles is split up into what two sections?
upper and lower extremities
upper extremity components
pectoral girdle, humerus, forearm, carpal bones, and the hand
pectoral girdle components
scapula and clavicle
what is the pectoral girdle also called?
the shoulder
pectoral girdle function
- anchors the upper limb to axial body
- allows movement of the shoulder
- site of glenohumeral joint**
scapula location
- flat, triangular bone
- located in the upper back
- connects to the clavicle
scapula function
- serves as anchoring point for the upper limb
- site for attachment of humerus
- provides surface for movement for the humerus
what is the scapula also called?
shoulder blade
scapula components
body, glenoid fossa, spine, acromion process, coracoid process
scapula body location
shoulder blade
scapula glenoid fossa location
- a shallow, pyriform articular surface
- located on the lateral angle of the scapula
scapula glenoid fossa function
- humerus articulates here
- anchoring point of limb
scapula spine location
- extends across the dorsal surface of scapula
- runs through the anterior
scapula spine function
-origin to part of the supraspinatus fossa and infraspinatus fossa
scapula acromion process location
-the high-point located at the lateral end of the spine
scapula acromion process function
- attachment site for portion of the deltoideus muscle(arm abductor)
- attachment site for upper fibers in trapezius muscle
- has a small articular facet for the distal end of clavicle to attach(clavicular facet)
what do the fibers in the trapezius muscle that attach to the acromion process do?
act as scapular rotators
scapula coracoid process location
- looks like a crow
- hook-like structure
- lateral edge of the superior anterior portion of the scapula
scapula coracoid process function
-attachment for ligaments and muscles
clavicle location
- large doubly curved bone
- located directly above first rib
clavicle function
- helps support upper limb at the shoulder
- serves as an attachment to the axial skeleton
- articulates with the acromion process laterally and the manubrium medially
what is the clavicle also known as?
the collar bone
humerus location
- long bone in upper arm
- located between the elbow joint and the shoulder
humerus components
head, anatomical neck, surgical neck, lateral and medial epicondyles, condyle, olecranon fossa, greater tubercle
humerus head location
- proximal end of humerus
- posterior side
humerus head function
- allows for great range of motion
- articulate with the glenoid fossa and scapula
humerus anatomical neck location
-ridge around the the outer limit of the head
humerus surgical neck location
- region inferior to tubercles
- top of humerus where the bone narrows
- common fracture site**
humerus shaft location
-long middle portion of humerus
humerus lateral and medial epicondyles location
- distal of bone
- just above condyles
humerus lateral and medial epicondyles function
- site for attachment of tendons of the muscles of forearm
- stabilizes elbow
humerus condyle location
-distal end of humerus
humerus condyle components
- capitulum
- trochlea
humerus condyle capitulum location
- smooth, round
- lateral portion of the distal articular surface of the humerus
humerus condyle capitulum function
-site of articulation for the head of radius
humerus condyle trochlea location
-medial portion of the articular surface of the elbow joint
humerus condyle trochlea function
-site of articulation for the ulna
humerus olecranon fossa location
- deep, triangular depression
- posterior side
- superior to trochlea
humerus olecranon fossa function
-where the olecranon process sits
humerus greater tubercle location
- lateral to the head
- proximal end
humerus greater tubercle function
-site of attachment of rotator cuff muscles
forearm components
ulna and radius
ulna location
- lines up with pinkie
- opposite side of the forearm
ulna function
- joins with larger end of humerus to make the elbow joint
- susceptible to fractures
ulna olecranon process location
- located on posterior proximal end
- sharp part of elbow
ulna olecranon process function
-articulates with the humerus by inserting in its olecranon fossa
ulna head location
- distal
- right before wrist flexes and extends
ulna styloid process location
- distal end of forearm
- projects from the medial and posterior part of bone
- descends a little lower than the head
ulna styloid process function
-attachment site for ligaments (ligament attaches)
radius location
- medial bone of the forearm
- lines up with thumb
radius components
- head
- styloid process
radial head location
- cylindrical
- just below elbow
- top of bone