Upper limb
An Introduction to the Appendicular Skeleton
• Learning Outcomes
– 8-1 Identify the bones that form the pectoral girdle,
their functions, and their superficial features.
– 8-2 Identify the bones of the upper limbs, their
functions, and their superficial features.
– 8-3 Identify the bones that form the pelvic girdle,
their functions, and their superficial features.
– 8-4 Identify the bones of the lower limbs, their
functions, and their superficial features.
– 8-5 Summarize sex differences and age-related
changes in the human skeleton.
An Introduction to the Appendicular Skeleton
• The Appendicular Skeleton
– 126 bones
– Allows us to move and manipulate objects
– Includes all bones besides axial skeleton
• The limbs
• The supportive girdles
• The appendicular skeleton functions primarily to
facilitate movement
Figure 8-1 The Appendicular Skeleton
SKELETAL SYSTEM 206
AXIAL SKELETON 80 APPENDICULAR SKELETON 126
(see Figure 7–1)
Clavicle 2
Pectoral
girdle 4
Scapula 2
Humerus 2
Upper
limbs 60 Radius 2
Ulna 2
Carpal 16
bones
Metacarpal
bones 10
Phalanges 28
Pelvic Hip bone 2
2
girdle
8-1 The Pectoral Girdle
• The Pectoral Girdle
– Also called shoulder girdle
– Connects the arms to the body
– Positions the shoulders
– Provides a base for arm movement
– Consists of:
• Two clavicles
• Two scapulae
– Connects with the axial skeleton only at the
manubrium
8-1 The Pectoral Girdle
• The Clavicles
– Also called collarbones
– Long, S-shaped bones
– Originate at the manubrium (sternal end)
– Articulate with the scapulae (acromial end)
Figure 8-2a The Right Clavicle
Scapula Clavicle Jugular notch
The position of the clavicle within
the pectoral girdle, anterior view.
Figure 8-2b The Right Clavicle
Acromial end Sternal
end
LATERAL MEDIAL
Facet for
articulation
with acromion Superior view of the right clavicle.
Figure 8-2c The Right Clavicle
Sternal
Acromial end facet
LATERAL Conoid Costal MEDIAL
tubercle tuberosity
Sternal end
Inferior view of the right clavicle.
Stabilizing ligaments attach to the conoid
tubercle and the costal tuberosity.
8-1 The Pectoral Girdle
• The Scapulae
– Also called shoulder blades
– Broad, flat triangles
– Articulate with arm and collarbone
– Anterior surface the subscapular fossa
8-1 The Pectoral Girdle
• The Scapulae
– Structures of the scapula
• Body has three sides
1. Superior border
2. Medial border (vertebral border)
3. Lateral border (axillary border)
8-1 The Pectoral Girdle
• The Scapulae
– Body has three corners
• Superior angle
• Inferior angle
• Lateral angle (head)
– The scapular head
• Holds glenoid cavity
• Which articulates with humerus
• To form shoulder joint (glenohumeral joint)
8-1 The Pectoral Girdle
• The Scapulae
– Processes of the glenoid cavity
• Coracoid process
– Anterior, smaller
• Acromion
– Posterior, larger
– Articulates with clavicle
– At the acromioclavicular joint
Figure 8-3a The Right Scapula
Superior
Acromion angle
Coracoid Superior
process border
Lateral
angle
Subscapular
fossa Body
Lateral border
Medial border
Inferior angle
Anterior view
Figure 8-3b The Right Scapula
Supraglenoid
tubercle
Acromion Coracoid
process
Glenoid
Spine cavity
Lateral border
Inferior angle
Lateral view
Figure 8-3c The Right Scapula
Supraspinous Coracoid Acromion
fossa process
Superior
border
Neck
Spine
Infraspinous
Body fossa
Medial
border
Lateral
border
Inferior angle
Posterior view
8-1 The Pectoral Girdle
• The Scapulae
– Posterior features of the scapula
• Scapular spine
– Ridge across posterior surface of body
• Separates two regions
1. Supraspinous fossa
2. Infraspinous fossa
8-2 The Upper Limbs
• The Upper Limbs
– Consist of:
• The arms, forearms, wrists, and hands
– Note: arm (brachium) = 1 bone, the humerus
8-2 The Upper Limbs
• The Humerus
– Also called the arm
– The long, upper arm bone
– Articulates with the Pectoral Girdle
8-2 The Upper Limbs
• The Humerus
– Tubercles of the proximal epiphysis
• Separated by the intertubercular groove
– Greater tubercle
» Lateral
» Forms tip of shoulder
– Lesser tubercle
» Anterior, medial
8-2 The Upper Limbs
• The Humerus
– Head
• Rounded, articulating surface
• Contained within joint capsule
– Anatomical neck
• Margin of joint capsule
– Surgical neck
• The narrow metaphysis
8-2 The Upper Limbs
• The Humerus
– The shaft
• Deltoid tuberosity
– A bulge in the shaft
– Attaches deltoid muscle
• Radial groove
– For radial nerve
– Posterior to deltoid tuberosity
8-2 The Upper Limbs
• The Humerus
– The distal epiphysis
• Medial and lateral epicondyles
– For muscle attachment
• Condyle of the humerus
– Articulates with ulna and radius
8-2 The Upper Limbs
• The Humerus
– Articular regions of the condyle
• Trochlea
– Coronoid fossa and olecranon fossa
– Articulates with ulna
• Capitulum
– Radial fossa
– Articulates with radius
Figure 8-4a The Right Humerus and Elbow Joint
Greater tubercle Head
Lesser tubercle
Intertubercular Anatomical
groove neck
Surgical
neck
Deltoid
tuberosity
Shaft
Radial fossa
Coronoid fossa
Lateral
epicondyle Medial
epicondyle
Capitulum Trochlea
Condyle
Anterior surface
Figure 8-4c The Right Humerus and Elbow Joint
Humerus
Medial epicondyle
Trochlea
Head of radius
Capitulum
Coronoid process of ulna
Radial notch of ulna
Elbow joint, anterior view
Figure 8-4b The Right Humerus and Elbow Joint
Head
Greater tubercle
Anatomical
neck
Surgical
neck
Deltoid
tuberosity
Radial groove
Olecranon fossa
Lateral
Medial epicondyle
epicondyle
Trochlea
Posterior surface
Figure 8-4d The Right Humerus and Elbow Joint
Humerus
Medial epicondyle
Olecranon fossa
Olecranon
Trochlea of humerus
Ulna
Head of radius
Elbow joint, posterior view
8-2 The Upper Limbs
• The Forearm
– Also called the antebrachium
– Consists of two long bones
1. Ulna (medial)
2. Radius (lateral)
8-2 The Upper Limbs
• The Ulna
– The olecranon
• Superior end of ulna
• Point of elbow
• Superior lip of trochlear notch
• Articulates with trochlea of humerus
– The coronoid process
• Inferior lip of trochlear notch
8-2 The Upper Limbs
• The Ulna
– Articulations with the humerus
• Forearm extended
– Olecranon enters olecranon fossa
• Forearm flexed
– Coronoid process enters coronoid fossa
8-2 The Upper Limbs
• The Ulna
– Other articulations
• Radial notch
– Articulates with head of radius
– Forms proximal radio-ulnar joint
• Ulnar head
– Prominent styloid process
– Attaches to articular disc between forearm and
wrist
Figure 8-5a The Right Radius and Ulna
Olecranon
Proximal Radial head
radioulnar Neck of
joint radius
ULNA RADIUS
Interosseous
membrane
Ulnar head Ulnar notch
of radius
Styloid process
Styloid process
of ulna
of radius
Posterior view
Figure 8-5b The Right Radius and Ulna
Trochlear notch
Radial head Coronoid process
Neck of Radial notch
radius
Ulnar tuberosity
Radial tuberosity
RADIUS ULNA
Interosseous
membrane
Distal radio-ulnar joint
Ulnar head
Styloid process
of radius
Anterior view
8-2 The Upper Limbs
• The Ulna
– Interosseous membrane
• A fibrous sheet
• Connects lateral margin of ulnar shaft to radius
8-2 The Upper Limbs
• The Radius
– Lateral bone of forearm
– Disk-shaped radial head above the neck
– Radial tuberosity below the neck, attaches biceps
– Articulations of the radius
• Ulnar notch
– Distal end
– Articulates with wrist and radius
• Styloid process
– Stabilizes wrist joint
Figure 8-5a The Right Radius and Ulna
Olecranon
Proximal Radial head
radioulnar Neck of
joint radius
ULNA RADIUS
Interosseous
membrane
Ulnar head Ulnar notch
of radius
Styloid process
Styloid process
of ulna
of radius
Posterior view
Figure 8-5b The Right Radius and Ulna
Trochlear notch
Radial head Coronoid process
Neck of Radial notch
radius
Ulnar tuberosity
Radial tuberosity
RADIUS ULNA
Interosseous
membrane
Distal radio-ulnar joint
Ulnar head
Styloid process
of radius
Anterior view
Figure 8-5c The Right Radius and Ulna
Olecranon
Trochlear notch
Coronoid process
Radial notch
Ulnar tuberosity
ULNA
Lateral view
of ulna, showing
trochlear notch
8-2 The Upper Limbs
• Eight Carpal Bones
– Four proximal carpal bones
– Four distal carpal bones
– Allow wrist to bend and twist
8-2 The Upper Limbs
• The Four Proximal Carpal Bones
1. Scaphoid
• Near styloid process
2. Lunate
• Medial to scaphoid
3. Triquetrum
• Medial to lunate
4. Pisiform
• Anterior to triquetrum
8-2 The Upper Limbs
• The Four Distal Carpal Bones
1. Trapezium
• Lateral
2. Trapezoid
• Medial to trapezium
3. Capitate
• Largest
4. Hamate
• Medial, distal
Figure 8-6 Bones of the Right Wrist and Hand
RADIUS
RADIUS
ULNA
Lunate Lunate
Scaphold Scaphold
Triquetrum
Trapezium
Trapezium
Pisiform
Trapezoid Trapezoid
I
Capitate Hamate I Capitate
V V
Metacarpal IV IV II
III III Metacarpal
bones II
bones
Proximal
phalanx
Distal
phalanx
Proximal
phalanx
Middle
phalanx
Distal
phalanx
Anterior view Posterior view
8-2 The Upper Limbs
• Metacarpal Bones
– The five long bones of the hand
– Numbered I–V from lateral (thumb) to medial
– Articulate with proximal phalanges
• Phalanges of the Hands
– 14 total finger bones
• Pollex (thumb)
– Two phalanges (proximal, distal)
• Fingers
– Three phalanges (proximal, middle, distal)
Figure 8-6a Bones of the Right Wrist and Hand
RADIUS
ULNA
Lunate
Scaphold
Triquetrum
Trapezium
Pisiform
Trapezoid
I
Capitate Hamate
V
Metacarpal IV
bones II III
Proximal
phalanx
Distal
phalanx
Anterior view
Figure 8-6b Bones of the Right Wrist and Hand
RADIUS
ULNA
Lunate
Scaphold
Triquetrum
Trapezium
Pisiform
Trapezoid
Hamate I Capitate
V
IV III II Metacarpal
bones
Proximal
phalanx
Middle
phalanx
Distal
phalanx
Posterior view
