Bones of appendicular skeleton lecture.ppt

PowerPoint®
Lecture Slides
prepared by Leslie Hendon,
University of Alabama,
Birmingham
HUMAN
ANATOMY
fifth edition
MARIEB | MALLATT | WILHELM
8
Copyright © 2008 Pearson Education, Inc.,
publishing as Benjamin Cummings
Bones,
Part 1: The
Appendicular
Skeleton
PART 1

Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings
The Appendicular Skeleton
 Pectoral girdle
 Attaches the upper limbs to the trunk
 Pelvic girdle
 Attaches the lower limbs to the trunk
 Upper and lower limbs differ in function
 Share the same structural plan

The Pectoral Girdle
 Consists of the clavicle and the scapula
 Pectoral girdles do not quite encircle the body
completely
 Medial end of each clavicle articulates with the
manubrium and first rib
 Laterally – the ends of the clavicles join the
scapulae
 Scapulae do not join each other or the axial
skeleton

The Pectoral Girdle
 Provides attachment for many muscles that move
the upper limb
 Girdle is very light and upper limbs are mobile
 Only clavicle articulates with the axial skeleton
 Socket of the shoulder joint (glenoid cavity) is
shallow
Good for flexibility – bad for stability

Articulated Pectoral Girdle
Figure 8.1a
PLAY Shoulder

Clavicles
 Extend horizontally across the superior thorax
 Sternal end articulates with the manubrium
 Acromial end articulates with scapula

Clavicles
Figure 8.1b, c

PLAY Shoulder
Clavicles
 Provide attachment for muscles
 Hold the scapulae and arms laterally
 Transmit compression forces from the upper limbs
to the axial skeleton

Scapulae
 Lie on the dorsal surface of the rib cage
 Located between ribs 2 – 7
 Have three borders
 Superior
 Medial (vertebral)
 Lateral (axillary)
 Have three angles
 Lateral, superior, and inferior

Structures of the Scapula
Figure 8.2a

Figure 8.2b

Figure 8.2c

The Upper Limb
 30 bones form each upper limb
 Grouped into bones of the
 Arm
 Forearm
 Hand

Arm
 Region of the upper limb between the shoulder
and elbow
 Humerus
 The only bone of the arm
 Longest and strongest bone of the upper limb
 Articulates with the scapula at the shoulder
 Articulates with the radius and ulna at the elbow

Arm
 Humerus
 Many structures of the humerus provide sites for
muscle attachment
 Other structures of the humerus provide
articulation sites for other bones

Structures of the Humerus of the Right Arm
Figure 8.3a, b

Forearm
 Formed from the radius and ulna
 Proximal ends articulate with the humerus
 Distal ends articulate with carpals
PLAY Elbow

Forearm
 Radius and ulna articulate with each other
 At the proximal and distal radioulnar joints
 The interosseous membrane
 Interconnects radius and ulna
 In anatomical position
 The radius is lateral and the ulna is medial

Details of Arm and Forearm
Figure 8.5a

Ulna
 Main bone responsible for forming the elbow joint
with the humerus
 Hinge joint allows forearm to bend on arm
 Distal end is separated from carpals by
fibrocartilage
 Plays little to no role in hand movement

Proximal Part of the Ulna
Figure 8.5b

Radius and Ulna
Figure 8.4a, b

Radius
 Superior surface of the head of the radius
articulates with the capitulum
 Medially – the head of the radius articulates with
the radial notch of the ulna
 Contributes heavily to the wrist joint
 Distal radius articulates with carpal bones
 When radius moves, the hand moves with it

Distal Ends of the Radius and Ulna
Figure 8.5c

PowerPoint®
Lecture Slides
Birmingham
HUMAN
ANATOMY
fifth edition
8
Bones,
Part 1: The
Appendicular
Skeleton
PART 2

Hand
 Includes the following bones
 Carpus – wrist
 Metacarpals – palm
 Phalanges – fingers

Carpus
 Forms the true wrist – the proximal region of the
hand
 Gliding movements occur between carpals
 Composed of eight marble-sized bones

Carpus
 Carpal bones
 Are arranged in two irregular rows
 Proximal row from lateral to medial
Scaphoid, lunate, triquetral, and pisiform
 Distal row from lateral to medial
Trapezium, trapezoid, capitate, and hamate
 A mnemonic to help remember carpals
Sally left the party to take Carmen home

Bones of the Hand
Figure 8.7a, b

Metacarpus
 Five metacarpals radiate distally from the wrist
 Metacarpals form the palm
 Numbered 1–5, beginning with the pollex (thumb)
 Articulate proximally with the distal row of carpals
 Articulate distally with the proximal phalanges

Phalanges
 Numbered 1–5, beginning with the pollex (thumb)
 Except for the thumb, each finger has three
phalanges
 Proximal, middle, and distal

Bones of the Appendicular Skeleton
Table 8.1 (1 of 2)

Pelvic Girdle
 Attaches lower limbs to the spine
 Supports visceral organs
 Attaches to the axial skeleton by strong ligaments
 Acetabulum is a deep cup that holds the head of
the femur
 Lower limbs have less freedom of movement
Are more stable than the arm

Pelvic Girdle
 Consists of paired hip bones (coxal bones)
 Hip bones unite anteriorly with each other
 Articulates posteriorly with the sacrum
PLAY Hip

Bony Pelvis
 A deep, basin-like structure
 Formed by
 Coxal bones, sacrum, and coccyx

Bony Pelvis
Figure 8.8a
PLAY Pelvis

Coxal Bones
 Consist of three separate bones in childhood
 Ilium, ischium, and pubis
 Bones fuse – retain separate names to regions of
the coxal bones
 Acetabulum
 A deep hemispherical socket on lateral pelvic
surface

Ilium
 Large, flaring bone
 Forms the superior region of the coxal bone
 Site of attachment for many muscles
 Articulation with the sacrum forms sacroiliac joint

Ischium
 Forms posteroinferior region of the coxal bone
 Anteriorly – joins the pubis
 Ischial tuberosities
 Are the strongest part of the hip bone

Pubis
 Forms the anterior region of the coxal bone
 Lies horizontally in anatomical position
 Pubic symphysis
 The two pubic bones are joined by fibrocartilage at
the midline

Lateral and Medial Views of the Hip Bone
Figure 8.8b, c

True and False Pelves
 Bony pelvis is divided into two regions
 False (greater) pelvis – bounded by alae of the iliac
bones
 True (lesser) pelvis – inferior to pelvic brim
Forms a bowl containing the pelvic organs

True and False Pelves
Figure 8.9b

PowerPoint®
Lecture Slides
Birmingham
HUMAN
ANATOMY
fifth edition
8
Bones,
Part 1: The
Appendicular
Skeleton
PART 3

Pelvic Structures and Childbearing
 Major differences between male and female pelves
 Female pelvis is adapted for childbearing
Pelvis is lighter, wider, and shallower than in the
male
Provides more room in the true pelvis

Female and Male Pelves
Table 8.2 (1 of 2)

Female and Male Pelves
Table 8.2 (2 of 2)

The Lower Limb
 Carries the entire weight of the erect body
 Bones of lower limb are thicker and stronger than
those of upper limb
 Divided into three segments
 Thigh, leg, and foot

Thigh
 The region of the lower limb between the hip and
the knee
 Femur – the single bone of the thigh
 Longest and strongest bone of the body
 Ball-shaped head articulates with the acetabulum

Structures of the Femur
Figure 8.10b

Patella
 Triangular sesamoid bone
 Imbedded in the tendon that secures the
quadriceps muscles
 Protects the knee anteriorly
 Improves leverage of the thigh muscles across the
knee

Leg
 Refers to the region of the lower limb between the
knee and the ankle
 Composed of the tibia and fibula
 Tibia – more massive medial bone of the leg
Receives weight of the body from the femur
 Fibula – stick-like lateral bone of the leg
 Interosseous membrane
 Connects the tibia and fibula
PLAY Knee

Leg
 Tibia articulates with femur at superior end
 Forms the knee joint
 Tibia articulates with talus at the inferior end
 Forms the ankle joint
 Fibula does not contribute to the knee joint
 Stabilizes the ankle joint

Structures of the Tibia and Fibula
Figure 8.11a, b

The Foot
 Foot is composed of
 Tarsus, metatarsus, and the phalanges
 Important functions
 Supports body weight
 Acts as a lever to propel body forward when
walking
 Segmentation makes foot pliable and adapted to
uneven ground

Tarsus
 Makes up the posterior half of the foot
 Contains seven bones called tarsals
 Body weight is primarily borne by the talus and
calcaneus

Metatarsus
 Consists of five small long bones called
metatarsals
 Numbered 1–5 beginning with the hallux
(great toe)
 First metatarsal supports body weight

Phalanges of the Toes
 14 phalanges of the toes
 Smaller and less nimble than those of the fingers
 Structure and arrangement are similar to phalanges
of fingers
 Except for the great toe, each toe has three
phalanges
Proximal, middle, and distal

Bones of the Foot
Figure 8.12a

Bones of the Foot
Figure 8.12b

Bones of the Foot
Figure 8.12c
PLAY Bones of the Foot

Arches of the Foot
 Foot has three important arches
 Medial and lateral longitudinal arch
 Transverse arch
 Arches are maintained by
 Interlocking shapes of tarsals
 Ligaments and tendons

Arches of the Foot
Figure 8.13

Lower Limb and Pelvis
Table 8.1 (2 of 2)

Disorders of the Appendicular Skeleton
 Bone fractures
 Hip dysplasia
 Head of the femur slips out of acetabulum
 Clubfoot
 Soles of the feet turn medially

The Appendicular Skeleton Throughout Life
 Growth of the appendicular skeleton
 Increases height
 Changes body proportions
 Upper-lower body ratio changes with age
 At birth head and trunk are 1.5 times as long as
lower limbs
 Lower limbs grow faster than the trunk
 Upper-lower body ratio of 1 to 1 by age 10

Changes in Body Proportions
Figure 8.14

The Appendicular Skeleton Throughout Life
 Few changes occur in adult skeleton until middle
age, when
 Skeleton loses mass
 Osteoporosis and limb fractures become more
common

Bones of appendicular skeleton lecture.ppt

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