#7 Arm / Hands Flashcards
What joint allows for flexion and extension in the upper limb?
Elbow joint
The elbow joint is facilitated by the u-shaped part of the ulna.
Where is the olecranal region located?
At the back of the elbow
It is where the humerus meets the ulna and radius.
What is the olecranon fossa?
A depression on the humerus
It is important for preventing hyperextension of the elbow.
What role does the ulna play in the elbow?
Responsible for hinge action
It allows for flexion and extension at the elbow.
What does the radius allow for?
Pronation and supination
It is in line with the thumb.
What are the three main types of bones in the hand?
Carpals, metacarpals, and phalanges
These bones are integral to hand structure and function.
How are metacarpals numbered?
1-5 starting from the thumb
This numbering system helps identify each metacarpal.
How many phalanges does the thumb have?
Two phalanges
They are the proximal and distal phalanges.
How many phalanges do other fingers have?
Three phalanges
They consist of proximal, middle, and distal phalanges.
What classification do phalanges fall under?
Long bones
This classification is due to their length relative to width.
What is the primary function of the clavicle?
Holds the shoulders out from the body
It is crucial for shoulder positioning.
Describe the scapula.
A triangular bone resembling a shovel
It provides muscle attachment sites for arm movement.
What is the acromion?
A part of the scapula
It is located at the shoulder’s outer edge.
What is the largest bone in the upper arm?
Humerus
It has a rounded head that fits into the glenoid fossa of the scapula.
What prevents hyperextension of the elbow?
Olecranon fossa
It is a feature of the humerus.
What is the radial tuberosity?
A bony bump on the radius
It serves as a site for muscle attachment.
What are carpals classified as?
Short bones
They allow for limited gliding motion at the wrist.
What do metacarpals form?
The palm of the hand
They are also numbered 1-5 from the thumb.
What is the numbering system for phalanges similar to?
The toes
This helps in identifying finger bones.
What forms the pectoral girdle?
Clavicle and scapula
This structure is essential for shoulder movement.
What is unique about the femur compared to the humerus?
The femur has a neck
This feature is unlike the humerus.
True or False: The ‘funny bone’ sensation is due to the ulnar nerve.
True
It is not due to the bone itself.
Fill in the blank: The _______ is crucial for elbow flexion and extension.
ulna
Fill in the blank: The _______ are the bones of the fingers.
phalanges
Fill in the blank: The _______ is located at the shoulder’s outer edge.
acromion
