The Appendicular Skeleton - Anatomy and Physiology - Laboratory Flashcards
The appendicular skeleton is composed of
- two pectoral girdles with the attached upper limbs
- pelvic girdle with the attached lower limbs
how many bone in appenidcular skeleton
126 bones
function of appendicular skeleton
enable us to move and manipulate our surroundings
attach the upper limbs to the axial skeleton and provide attachment sites for many muscles of the trunk and neck
pectoral girdles
each consisting of an anterior clavicle and a posterior scapula
pectoral girdles
clavicle is commonly called the
collarbone
is an S-shaped flat bone and the only bony connection between the pectoral girdle and the axial skeleton.
clavicle
It anchors the arm to the body (such as when you hang from a tree branch).
clavicle
The major features of the clavicle include the
- sternal (medial) end
- acromial (lateral) end
articulates with the manubrium of the sternum
sternal (medial) end
the broader, flattened, roughened end that articulates with the acromion of the scapula
acromial (lateral) end
a point on the inferior surface of the lateral end of the clavicle, attaches the clavicle to the coracoid process of the scapula.
conoid tubercle
scapula is commonly called the
shoulder blade
is a large, triangular flat bone with superior, medial,
and lateral borders
scapula
(Scapula) The corners where the borders meet are the
superior, lateral, and inferior angles.
on the superior border serves as a passageway for
nerves
suprascapular notch
a flattened, expanded process that projects from the lateral end of the spine and articulates with the clavicle, is easily felt as the high point of the shoulder
acromion
a shallow depression inferior to the acromion, receives the head of the humerus to form the glenohumeral (shoulder) joint.
glenoid cavity
extends anteriorly from the scapula and is an attachment site for several tendons and ligaments.
coracoid process
is a prominent ridge that divides the posterior surface of the scapula into the supraspinous fossa and the infraspinous fossa
spine
the bone of the arm
humerus
articulates with the shallow glenoid cavity to form the glenohumeral (shoulder) joint. (humerus)
head
separates the diaphysis of the bone from the head.
anatomical neck
is so named because it is a common site of fractures that require surgical repair.
surgical neck
are attachment sites for shoulder muscles
- greater tubercle
- lesser tubercle
- deltoid tuberosity
a depression that runs along the posterior margin of the deltoid tuberosity, marks the course of a nerve that extends to the forearm.
radial groove
the medial condyle on the distal end of the humerus, articulates with the ulna
trochlea
the lateral condyle on the distal end of the humerus,
articulates with the radius
capitulum
a depression on the anterodistal surface of the humerus, receives the coronoid process of the ulna
coronoid fossa
a depression on the posterodistal surface of the humerus,
receives the olecranon process of the ulna.
olecranon fossa
a small process proximal to the lateral condyle
lateral epicondyle
a small process proximal to the medial condyle, are attachment sites for forearm muscles
medial epicondyle
is located on the lateral aspect (thumb side) of the forearm
radius
proximal, disc-shaped _______________articulates with the capitulum of the humerus.
radial head
is a constricted region distal to the head
radial neck
a projection just distal to the neck, is an attachment site for the biceps brachii, the major anterior arm muscle.
radial tuberosity
located at the distal end of the radius, receives the head of the ulna.
ulnar notch
forms the lateral boundary of the wrist
styloid process
the medial bone of the forearm, is longer than the radius and connects to the radius through an interosseous membrane
ulna
The ulna, the medial bone of the forearm, is longer than the radius and connects to the radius through an
The ulna (see Figure 10-5), the medial bone of the forearm,
is longer than the radius and connects to the radius through
an
a process on the posterior surface of the proximal end, articulates with the humerus at the olecranon fossa.
olecranon
on the anterior surface of the proximal end extends into the
coronoid fossa of the humerus during flexion. (ulna)
coronoid process
a large, curved area between the olecranon and coronoid process, articulates with the humerus at the trochlea.
trochlear notch
at the proximal end of the ulna receives the head of the radius
radial notch
the distal end of the ulna, articulates with the lunate of the carpals.
ulnar head
is a short projection of the ulnar head that creates the medial boundary of the wrist
styloid process
The wrist, hand, and fingers consist of three sets of bones:
carpals, metacarpals, and phalanges
wrist or
carpus
The wrist (carpus) consists of eight short carpal bones arranged into two transverse rows of four bones each. In the proximal row (lateral to medial) are the
scaphoid, lunate, triquetrum, and pisiform
The wrist (carpus) consists of eight short carpal bones arranged into two transverse rows of four bones each. In the proximal row (lateral to medial) are the scaphoid, lunate, triquetrum, and pisiform. In the distal row (lateral to medial) are the
e trapezium, trapezoid, capitate, and hamate
The hand (manus) consists of _______metacarpal bones
five
The fingers consists of _____ phalanges (singular = phalanx), or bones of the digits.
14
consists of two large, irregular pelvic (hip) bones
pelvic girdle
pelvic girdle is also called
coxal bone
articulates with the sacrum of the vertebral column and attaches the lower limbs to the axial skeleton.
pelvic girdle
Together, the pelvic bones and the sacrum and coccyx of the axial skeleton form the
bony pelvis
Each pelvic bone is actually three separate bones
ilium,ischium, and pubis (pubic bone)
a deep socket at the point of fusion of the ilium, ischium, and pubis, receives the head of the femur to form the hip joint
acetabulum
the largest foramen in the skeleton, is formed by
the fusion of the ischium and pubis; blood vessels and nerves travel through it.
obturator foramen
Finally, the joint where the two pubic bones meet is the
pubic symphysis
is the largest and most superior bone of the pelvic bone
ilium
is the long, superior ridge of the ilium you feel when you place your hands on your hips.
iliac crest
is the joint between the pubis of each pelvic bone.
pubic symphysis
formed where the inferior ramus of each pubic bone unites
pubic arch
or thigh bone, is the heaviest, longest, and strongest bone in the body.
femur
articulates proximally with a pelvic bone to form a hip joint, and distally with the tibia and patella to form the knee joint.
femur
The head is a ball-shaped projection at the proximal end of the femur that contains a small, central depression called the
fovea capitis
where a ligament extending from the acetabulum attaches to secure the femur in the hip joint.
fovea capitis
a constricted region of the bone distolateral to the head, is the weakest part of the femur; its fracture results in a “broken hip.” (femur)
neck
are attachment sites for hip muscles
greater trochanter and the lesser trochanter
is a roughened projection on the posteroproximal surface that blends into a roughened line called the linea aspera
gluteal tuberosity
large rounded projections on the distal femur—articulate with the lateral condyle of the tibia and the medial condyle of the tibia, respectively.
lateral condyle and the medial condyle
projections located just superior to the condyles, serve as attachment sites for knee and hip muscles.
lateral and medial epicondyles
the area between the condyles on the anterior surface, articulates with the patella
patellar surface
or kneecap, is a small, triangular, sesamoid bone
patella
The broad proximal end of patella is called the
base
the pointed distal end of patella is called the
apex
or shin bone, is second only to the femur in size and strength.
tibia
It articulates proximally with the fibula and the femur, and distally with the fibula and the talus bone of the ankle.
tibia
an irregular projection created by the ligaments of the knee joint, separates the lateral and medial condyles
intercondylar eminence
a projection on the anterior proximal surface of the tibia, is an attachment site for the patellar ligament.
tibial tuberosity
is a sharp ridge inferior to and continuous with the tibial tuberosity
anterior crest
an expansion of the distal end of the tibia, articulates with the talus bone of the ankle and forms the prominence that can be felt on the medial surface of the ankle
medial malleolus
a thin, stick-like bone that lies parallel and lateral to the tibia, articulates both proximally and distally with the tibia and is part of the knee joint.
fibula
The ankle, foot, and toes consist of three sets of bones:
tarsals, metatarsals, and phalanges
The ankle (tarsus) consists of seven short tarsal bones:
- talus
- calcaneus
- navicular
- cuboid
- medial cuneiform
- intermediate cunieform
- lateral cuneiform
is the only ankle bone that articulates with the tibia and the fibula.
talus
is the attachment site for the Achilles (calcaneal) tendon.
calcaneus (or heel bone)