5 Appendicular Skeleton Flashcards
another name for shoulder girdle
pectoral girdle
what does the pectoral girdle consist of?
two bones: a clavicle and a scapula
another name for pectoral girdle
shoulder girdle
what consists of a clavicle and a scapula
the pectoral girdle
clavicle
collarbone; attaches to the manubrium of the sternum medially and to the scapula laterally
collarbone
clavicle
attaches to the manubrium of the sternum medially and to the scapula laterally
clavicle
what is the purpose of the clavicle?
acts as a brace to hold the arm away from the top of the thorax and helps prevent shoulder dislocation
acts as a brace to hold the arm away from the top of the thorax and helps prevent shoulder dislocation
clavicle
when this is broken, the whole shoulder region caves in medially
clavicle
scapulae
shoulder blades;
triangular bone commonly called “wings” because they flare when we move our arms posteriorly
scapulae
shoulder blades
scapulae
description of scapulae
triangular; each has a flattened body and two important processes: the acromion and the beaklike corocoid
triangular; each has a flattened body and two important processes: the acromion and the beaklike corocoid
scapulae (the two scapula)
where does the scapulae attach to the clavicle?
at the acromioclavicular joint; the acromion process of the scapula connects with the clavicle laterally at this joint
acromioclavicular joint
where the acromion process of the scapula connects with the clavicle laterally
acromion process
the enlarged end of the spine of the scapula; part of the scapula that connects with the clavicle laterally
the enlarged end of the spine of the scapula
acromion process
part of the scapula that connects with the clavicle laterally
acromion process
coracoid process
is a small hook-like structure on the lateral edge of the superior anterior portion of the scapula; anchors some muscles of the arm; Pointing laterally forward, it, together with the acromion, serves to stabilize the shoulder joint
a small hook-like structure on the lateral edge of the superior anterior portion of the scapula
coracoid process
together with the acromion, it serves to stabilize the shoulder joint
coracoid process
suprascapular notch
medial to the coracoid process of the scapula; large indentation which serves as a nerve passageway
indentation medial to the coracoid process of the scapula
suprascapular notch
large indentation on the superior edge of the scapula which serves as a nerve passageway
suprascapular notch
how is the scapula attached to the axial skeleton?
it is not directly attached; it is loosely held in place by trunk muscles
it is not directly attached to the axial skeleton; it is loosely held in place by trunk muscles
scapula
what are the three borders of the scapula?
superior
medial (vertebral)
lateral (axillary)
the three angles (corners) of the scapula
superior
inferior
lateral
glenoid cavity
shallow socket on the scapula that receives the head of the arm bone; is in the lateral angle
shallow socket on the scapula that receives the head of the arm bone; is in the lateral angle
glenoid cavity
part of the scapula that connects with the humerus
glenoid cavity
drawback to the lightness of the pectoral girdle that allows exceptional free movement and flexibility tot he upper limb
pectoral girdle is very easily dislocated
factors that cause the pectoral girdle to be very light and allow extremely free movement of the upper limbs
- -pectoral girdle only attaches to the axial skeleton at one point: the sternoclavicular joint
- -loose attachment of the scapula allows it to slide back and forth against the thorax as muscles act
- -glenoid cavity is shallow and shoulder joint poorly reinforced by ligaments
what is the arm formed by?
a single bone, the humerus
humerus
single long bone that forms the arm
at the proximal end of this bone is a rounded head that fits into the shallow glenoid cavity of the scapula
humerus
what is at the proximal end of the humerus
a rounded head that fits into the shallow glenoid cavity of the scapula
anatomical neck
immediately inferior to the head of the humerus; obliquely directed; its upper half represented by a narrow groove that separates the head of the humerus from the two tubercles
immediately inferior to the head of the humerus; obliquely directed; its upper half represented by a narrow groove that separates the head of the humerus from the two tubercles
anatomical neck
greater and lesser tubercles of the humerus
two bony projections anterolateral to the head; sites of muscle attachment; separated from each other by the deep groove of the intertubercular sulcus and from the head by the anatomical neck
two bony projections anterolateral to the head of the humerus and sites of muscle attachment
greater and lesser tubercles
intertubercular sulcus
deep groove separating the greater and lesser tubercles at the proximal end of the humerus
deep groove separating the greater and lesser tubercles at the proximal end of the humerus
intertubercular sulcus
surgical neck of the humerus
just distal to the tubercles at the proximal end; where the humerus thins from the head
just distal to the tubercles at the proximal end; where the humerus thins from the head
surgical neck
deltoid tuberosity
roughened area midpoint of the shaft of the humerus; where the large deltoid muscle of the shoulder attaches
roughened area midpoint of the shaft of the humerus
deltoid tuberosity
where the large deltoid muscle of the shoulder attaches to the humerus
deltoid tuberosity
radial groove
runs obliquely down the posterior aspect of the humerus shaft; marks the course of the radial nerve (important nerve of upper limb)
runs obliquely down the posterior aspect of the humerus shaft
radial groove
marks the course of the radial nerve (important nerve of upper limb) along the posterior of the humerus
radial groove
trochlea
spool-like medial portion of the articular surface of the elbow joint on the humerus; articulates with the trochlear notch on the ulna
spool-like medial portion of the articular surface of the elbow joint on the humerus
trochlea
portion of humerus that articulates with the trochlear notch on the ulna
trochlea
capitulum
lateral ball-like portion of the distal humerus that articulates in the elbow joint with the head of the radius
lateral ball-like portion of the distal humerus that articulates in the elbow joint with the head of the radius
capitulum
elbow joint
medial trochlea of humerus articulates with the trochlear notch of ulna
lateral capitulum of the humerus articulates with the head of the radius
coronoid fossa
anterior depression above the trochlea on the humerus; receives the coronoid process of the ulna during flexion of the forearm
anterior depression above the trochlea on the humerus
coronoid fossa
part of humerus that receives the coronoid process of the ulna during flexion of the forearm
coronoid fossa
olecranon fossa
posterior depression above the trochlea on the humerus; receives the olecranon of the ulna during extension of the forearm
posterior depression above the trochlea on the humerus
olecranon fossa
part of humerus that receives the olecranon of the ulna during extension of the forearm
olecranon fossa
flexion of the forearm
flexion: coronoid fossa of the humerus receives coronoid process of the ulna
coronoid fossa of the humerus receives coronoid process of the ulna
flexion of the forearm
extension of the forearm
extension: olecranon fossa of the humerus receives the olecranon of the ulna
olecranon fossa of the humerus receives the olecranon of the ulna
extension of the forearm
medial epicondyle
raised area medial to the trochlea on the distal end of the humerus; larger, more prominent and slightly more posterior in anatomical position than lateral epicondyle
lateral epicondyle
raised area lateral to the trochlea on the distal end of the humerus; posterior to capitulum
epicondyles of the humerus
lateral and medial; flank the coronoid fossa and the olecranon fossa of the elbow joint
flank the coronoid fossa and the olecranon fossa of the elbow joint
lateral and medial epicondyles
bones that form the forearm
radius
ulna
radius and ulna in anatomical position
radius is the lateral bone (thumb)
ulna is the medial bone (pinkie)
lateral bone of the forearm
radius
medial bone of the forearm
ulna
thumb-side bone of the forearm
radius
pinkie-side bone of the forearm
ulna
what happens to the bones of the forearm when the hand is rotated so the palm faces posteriorly?
the distal end of the radius crosses over and ends up medial to the ulna
when is the radius medial to the ulna?
when the palm is rotated so it faces posterior
where do the radius and ulna articulate?
articulate both proximally and distally at small radioulnar joints
radioulnar joints
proximal radioulnar joint and distal radioulnar joint; where the radius and ulna articulate
how are the radius and ulna connected?
at both ends at the radioulnar joints and along entire length by the interosseous membrane
interosseous membrane
flexible membrane that connects the radius and ulna along entire length
flexible membrane that connects the radius and ulna along entire length
interosseous membrane
what do both the radius and the ulna have at their distal ends?
both have a styloid process
what does the disc-shaped head of the radius forms a joint with?
the capitulum of the humerus
radial tuberosity
where the tendon of the biceps muscle attaches; just below the head of the radius
where the tendon of the biceps muscle attaches to the radius
radial tuberosity
process just below the head of the radius
radial tuberosity
these two processes of the ulna grip the trochlea of the humerus in a pliers-like joint
coronoid process and olecranon; they are separated by the trochlear notch
what parts of the ulna are separated by the trochlear notch?
coronoid process on the anterior and olecranon on the posterior
anterior process on the proximal end of the ulna; part of joint that grips the trochlea of the humerus
coronoid process
posterior process on the proximal end of the ulna; part of joint that grips the trochlea of the humerus
olecranon
coronoid process
anterior process on the proximal end of the ulna; part of joint that grips the trochlea of the humerus
olecranon
posterior process on the proximal end of the ulna; part of joint that grips the trochlea of the humerus
trochlear notch
large depression of the ulna, formed by the olecranon and the coronoid process; articulates with the trochlea of the humerus
large depression of the ulna, formed by the olecranon and the coronoid process; articulates with the trochlea of the humerus
trochlear notch
what does the skeleton of the hand consist of?
carpals
metacarpals
phalanges
carpal bones
bones of the wrist; eight bones arranged in two irregular rows of four bones each; form the carpus (wrist)
carpus
wrist
form the carpus
carpal bones
how are the carpals bound together?
ligaments that restrict movements between them
metacarpals
the five bones that form the palm of the hand; when the fist is clenched, the head form “knuckles”
the bones of the palm of the hand
metacarpals
form the knuckles
the heads of the metacarpals when the fist is clenched
the head of the metacarpals form these
knuckles
phalanges
bones of the fingers; each hand contains fourteen; three in each finger (proximal, middle, distal), two in thumb (proximal, distal)
how many phalanges in each hand?
fourteen; three in each finger (proximal, middle, distal), two in thumb (proximal, distal)
bones of the fingers
phalanges
how many phalanges in each finger?
three; two in thumb
what is the pelvic girdle composed of
two coxal bones (ossa coxae; hip bones) and the sacrum
together with the coccyx forms the pelvis
pelvic girdle
difference between pelvic girdle and bony pelvis
pelvic girdle = 2 coxal bones and sacrum
bony pelvis = 2 coxal bones, sacrum + coccyx
how are the pelvic girdle and bony pelvis related?
the bony pelvis is the pelvic girdle plus the coccyx
other names for coxal bones
ossa coxae
hip bones
other names for ossa coxae
coxal bones
hip bones
other names for hip bones
ossa coxae
coxal bones
bones are large and heavy and attach securely to the axial skeleton via the sacral attachment to the lowermost lumbar vertebrae
pelvic girdle
pelvic girdle
two hip bones and the sacrum; bones are large and heavy; attaches to the axial skeleton; sockets receive the thigh bones; function is bearing weight
what are the bones of the pelvic girdle like
large and heavy
how does the pelvic girdle attach securely to the axial skeleton?
via the sacral attachment to the lowermost vertebrae
sockets of the pelvic girdle
receive the thigh bones; are deep and heavily reinforced by ligaments that attach the limbs firmly to the girdle
most important function of the pelvic girdle
bearing weight; total weight of the upper body rests on the pelvis
what organs lie within and are protected by the pelvis?
reproductive organs
urinary bladder
part of large intestine
each hip bone is formed by what?
the fusion of three bones:
ilium
ischium
pubis
is formed by the fusion of the ilium, ischium, and pubis
hip bone
ilium
large, flaring bone that forms most of the hip bone; connects posteriorly to the sacrum
large, flaring bone that forms most of the hip bone
ilium
part of hip bone that connects posteriorly to the sacrum
ilium; connects at the sacroiliac joint
where does the ilium connect to the sacrum?
sacroiliac joint
sacroiliac joint
where the ilium of the hip bone connects posteriorly to the sacrum
alae of the ilia
wing-like portions of the ilia of the hip bone; putting hands on hips = hands resting over alae (ala of an ilium, singular); upper edge is iliac crest
wing-like portions of the ilia of the hip bone
alae (singular: ala)
when you put your hands on your hips they are resting over this
the ala, the wing-like portion of the ilium of the hip bone
iliac crest
upper edge of ala; runs from anterior superior iliac spine to posterior superior iliac spine; important landmark when giving intramuscular injections
upper edge of ala
iliac crest
runs between anterior superior iliac spine to posterior superior iliac spine
iliac crest
what are below the anterior and posterior superior iliac spines?
small inferior spines:
anterior inferior iliac spine
posterior inferior iliac spine
ischium
“sit-down bone”; forms the inferior part of the coxal (hip) bone
“sit-down bone”
ischium
forms the inferior part of the coxal bone
ischium
ischial tuberosity
roughened area of the ischium that receives body weight when you are sitting
roughened area of the hip bone that receives body weight when you are sitting
ischial tuberosity
ischial spine
superior to ischial tuberosity on coxal bone; important landmark in pregnant women because narrows the outlet of the pelvis
process superior to ischial tuberosity on coxal bone
ischial spine
important landmark in pregnant women because narrows the outlet of the pelvis
ischial spine
greater sciatic notch
located posteriorly on superior part of ischium; allows blood vessels and the large sciatic nerve to pass from the pelvis posteriorly into the thigh
important bone marking located posteriorly on superior part of ischium
greater sciatic notch
allows blood vessels and the large sciatic nerve to pass from the pelvis posteriorly into the thigh
greater sciatic notch
pubis
most anterior part of the coxal bone; pubic bones fuse anteriorly to form pubic symphysis; fuses with the ischium to enclose obturator foramen
most anterior part of the coxal bone
pubis
oburator foramen
opening on the inferior coxal bone that allows blood vessels and nerves to pass to the anterior part of the thigh; formed by the fusion of the rami of the pubis anteriorly to the ischium posteriorly, creating the bar of bone that forms the enclosure
opening on the inferior coxal bone that allows blood vessels and nerves to pass to the anterior part of the thigh
oburator foramen
the fusion of the rami of the pubis anteriorly to the ischium posteriorly, creates the bar of bone that forms this enclosure
oburator foramen
pubic symphysis
cartilaginous joint formed by the pubic bones of each hip fusing anteriorly; midpoint of pubic arch
cartilaginous joint formed by the pubic bones of each hip fusing anteriorly
pubic symphysis
midpoint of pubic arch
pubic symphysis
pubic arch
anterior inferior arch formed by joining of the two pubic bones at the pubic symphysis
anterior inferior arch formed by joining of the two pubic bones at the pubic symphysis
pubic arch
acetabulum
the deep socket where the ilium, ischium and pubis fuse; receives the head of the thigh bone
the deep socket where the ilium, ischium and pubis fuse
acetabulum
socket of hip bone that receives the head of the thigh bone
acetabulum
the deep socket where the three bones of the coxal bone fuse
acetabulum
the two regions of the bony pelvis
false pelvis
true pelvis
false pelvis
the area medial the flaring portions of the ilia; superior to the true pelvis
the area medial the flaring portions of the ilia
false pelvis
true pelvis
area lying inferior to the flaring parts of the ilia and the pelvic brim; surrounded by bone; dimensions important in women b/c must be large enough to allow infants head to pass
area lying inferior to the flaring parts of the ilia and the pelvic brim
true pelvis
dimensions important in women b/c must be large enough to allow infants head to pass
true pelvis; particularly the outlet and inlet
pelvic brim
edge of the superior medial sides of the ilium and pubis
edge of the superior medial sides of the ilium and pubis
pelvic brim
outlet of true pelvis
inferior opening of the pelvis measured between the two ischial spines
inferior opening of the pelvis measured between the two ischial spines
outlet of true pelvis
inlet of true pelvis
superior opening between the right and left sides of the pelvic brim
superior opening between the right and left sides of the pelvic brim
inlet of the true pelvis
thigh bone
femur
femur
thigh bone; only bone in the thigh; heaviest, strongest bone in the body
only bone in the thigh
femur
heaviest, strongest bone in the body
femur
head of the femur
articulates with the acetabulum of the hip bone in a deep, secure socket
articulates with the acetabulum of the hip bone in a deep, secure socket
head of the femur
proximal end of the femur
has a ball-like head, a neck, and greater and lesser trochanters
greater and lesser trochanters
large, blunt, irregularly-shaped processes of the proximal end of the femur; located laterally of the head and neck with the greater trochanter superior and lateral to the lesser; separated anteriorly by the intertrochanteric line and posteriorly by the intertrochanteric crest
large, blunt, irregularly-shaped processes of the proximal end of the femur
greater trochanter and lesser trochanter
processes located laterally to the head and neck of the femur
greater trochanter and lesser trochanter
position of the greater and lesser trochanter to each other
greater trochanter is superior and lateral to the lesser trochanter
separated anteriorly by the intertrochanteric line and posteriorly by the intertrochanteric crest
greater trochanter and lesser trochanter
what separates the greater trochanter and lesser trochanter anteriorly?
intertrochanteric line
what separates the greater trochanter and lesser trochanter posteriorly?
intertrochanteric crest
what serve as sites for muscle attachment at the proximal end of the femur?
greater trochanter
lesser trochanter
gluteal tuberosity
bone marking on the femur that serves as an attachment site for the gluteus maximus
gluteal tuberosity
common fracture site on the femur
neck
why does the femur slant medially as it runs downward to join with the leg bones?
brings the knees in line with the body’s center of gravity
articular surfaces on the distal end of femur
lateral condyle
medial condyle
intercondylar fossa
patellar surface
lateral and medial condyles of the femur
rounded projections of the distal femur that articulate with the tibia; posteriorly separated by the deep intercondylar fossa
rounded projections of the distal femur that articulate with the tibia
lateral and medial condyles
intercondylar fossa
the deep notch on the posterior of the distal femur separating the lateral and medial condyles
the deep notch on the posterior of the distal femur separating the lateral and medial condyles
intercondylar fossa
patellar surface
smooth surface on the anterior distal femur which forms the joint with the patella
smooth surface on the anterior distal femur which forms the joint with the patella
patellar surface
the bones that form the skeleton of the leg
tibia and fibula
interosseous membrane
membrane that connects the tibia and fibula along their length
membrane that connects the tibia and fibula along their length
interosseous membrane
tibia
shinbone; the larger, medial leg bone
the larger legbone
tibia
the more-medial leg bone
tibia
shinbone
tibia
proximal end of the tibia
the medial and lateral condyles, separated by the intercondylar eminence, articulate with the distal end of the femur to form the knee joint
medial and lateral condyles of the tibia
articular projections of the proximal tibia; separated by the intercondylar eminence
articular projections of the proximal tibia
medial and lateral condyles
intercondylar eminence
spine at the superior proximal end of the tibia; separates the medial and lateral condyles
spine at the superior proximal end of the tibia
intercondylar eminence
separates the medial and lateral condyles of the tibia
intercondylar eminence
patellar ligament
encloses the patella and attaches to the tibial tuberosity on the anterior tibial surface
encloses the patella and attaches to the tibial tuberosity on the anterior tibial surface
patellar ligament
tibial tuberosity
roughened area on the anterior tibial surface where the patellar ligament attaches
roughened area on the anterior tibial surface where the patellar ligament attaches
tibial tuberosity
medial malleolus
process on the distal end of the tibia; forms the inner bulge of the ankle
forms the inner bulge of the ankle
medial malleolus
anterior border of the tibia
sharp ridge along the anterior surface of the tibia; unprotected by muscles and easily felt through skin
sharp ridge along the anterior surface of the tibia
anterior border
process on the distal end of the tibia
medial malleolus
fibula
thin and stick-like lateral bone of leg; has no part of forming the knee joint
position of leg bones
medial - tibia
lateral - fibula
lateral malleolus
process on distal end of fibula; forms outer part of ankle
process on distal end of fibula
lateral malleolus
forms outer part of ankle
lateral malleolus on fibula
what is the foot composed of
tarsals
metatarsals
phalanges
what are the functions of the foot?
supports body weight
serves as a lever to propel the body
tarsus
posterior half of foot; composed of seven tarsal bones
posterior half of foot
tarsus
what is body weight carried mostly by
the two largest tarsals; the calcaneus and the talus
calcaneus
heelbone; one of the two largest tarsal bones that support weight
heelbone
calcaneus
talus
ankle; lies between the tibia and the calcaneus
ankle bone
talus
lies between the tibia and the calcaneus
talus
metatarsals
the five bones that form the sole of the foot
the bones that form the sole of the foot
metatarsals
phalanges of the foot
like the fingers, 14 form the toes, each toe has three except great toe with two
like the fingers, 14 form the toes, each toe has three except great toe with two
phalanges of the foot.
how are the bones of the foot arranged?
to form three strong arches; two longitudinal (medial and lateral) and one transverse
what hold the feet in their arches?
ligaments bind the foot bones together
tendons of the foot muscles help to hold the bones in the arched position
difference between bone and cartilage
both connective tissue;
matrix: bone - hard & calcified matrix, cartilage firm & pliable
blood vessels: bone - lots, cartilage - none
what is bone
bone is connective tissue with calcified matrix and a lot of blood vessels
what is cartilage
cartilage is connective tissue with firm pliable matrix and no blood vessels
connective tissue with calcified matrix and a lot of blood vessels
bone
connective tissue with firm pliable matrix with no blood vessels
cartilage
what is the matrix of cartilage made of
glycoaminoglycans (sugar/protein/sugar)
describe cartilage fibers
collagen fibers, protein, stronger than steel; is elastic, stretches and recoils (ear lobe)
kinds of cartilage
hyaline
elastic
fibrous
costal
hyaline cartilage - kind and location
glassy, shiny; articulating surfaces of joints and embryonic skeleton
costal cartilage
connects the ribs to the sternum
elastic cartilage - kind and location
maintains shape and support but can bend; Eustachian tube in ear; ear lobes; keeps respiratory system open
fibrous cartilage - location
intervertebral discs and pubic symphysis
type of cartilage that is glassy and shiny
hyaline cartilage
type of cartilage that connects the ribs to the sternum
costal cartilage
type of cartilage on articulating surfaces of joints
hyaline cartilage
type of cartilage in embryonic skeleton
hyaline cartilage
type of cartilage that maintains shape and support but can bend
elastic cartilage
type of cartilage that keeps the respiratory system open
elastic cartilage
type of cartilage that makes the intervertebral discs
fibrous cartilage
type of cartilage that the pubic symphysis is composed of
fibrous cartilage