The Upper Limb aka The Arm
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Transcript of The Upper Limb aka The Arm
The Upper Limb aka The Arm
This is going to take some studying!
Bones of the upper limb (30/per limb)
Arm and Forearm• Humerus• Radius • Ulna
Wrist (8) • Scaphoid• Lunate • Triquetral• Pisiform• Trapezium• Trapezoid• Capitate• Hamate
– Just call them carpals!
Palm/Hand• Metacarpals (5)• Phalanges (14)• Proximal• Middle• Distal
Humerus
• Largest bone of upper limb
• Articulates with radius and ulna distally
• Proximally articulates with scapula at shoulder
AFV
Humerus
Points to know • Head – meets glenoid cavity
Posterior view
Humerus
Points to know • Greater tuberosity – Lateral tuberosity– Muscle attachment!
Posterior view
Humerus
Points to know • Lesser tuberosity – medial point of muscle
attachment
Posterior view
Humerus
Points to know • Deltoid tuberosity– Roughened site for rotator
cuff attachment
Posterior view
Humerus
Points to know • Trochlea – Articulation for the ulna
Posterior view
Humerus
Points to know • Capitulum– “ball like” attachment for
radius
Posterior view
Humerus
Points to know • Epicondyles– Ulnar n. runs behind medial
epicondyle
Posterior view
Humerus
• Coronoid fossa – Anterior fossa allows for
ulna to articulate when flexion happens
• Olecranon fossa – Posterior fossa allows
for ulna to articulate when extension happens
Antebrachium or Forearm
• Proximally articulate with humerus
• Distally articulate with carpal bones
• Radius and Ulna• Attach twice at
radioulnar joints • Interosseous membrane
between the two
UlnaWhat comes after L?
• The Ulna Forms Elbow• Olecranon process back • Coronoid process– Together form the hinge
joint with humerus
Bow!
Ulna info
• While a large part of elbow, very little influence on wrist
• Separated by fribrocartilaginous disc from wrist
• Distally ends in head and styloid process
• Where else did we see styloid process?
Radiusmajor forearm bone
• That at proximal end wide distally– (Opposite ulna)
• Very little contribution to elbow
• Large influence on wrist!
• Meaning: You move the radius, the hand will move!
Radius markings
• Head like a nail
Radius markings
• Head like a nail• Radial tuberosity –
anchors bicep
Radius markings
• Styloid process is distall – anchors ligaments to wrist
Radius markings
• Head like a nail• Radial tuberosity –
anchors bicep• Styloid process is distall
– anchors ligaments to wrist
“Getting a Grip” questions
1. According to the author, what made Richard Owen a genius?
2. What is the theme of this book?3. What pattern does Owen recognize?4. What does Darwin claim is responsible for
the similarities in animal limbs?5. What about the lung fish is not a coincidence
at all?6. Why is Ichthyostega a “let down?”