Skeleton System ( Appendicular Skeleton )

Question 1

What’s the function of the fibrous Joint connecting Radius and Ulna along their shafts?

Answer 1

Stabilises their association

Maintains their relative position in spite of forces applied from elbow and wrist

Question 2

What does the joints between metacarpel bones and phalanges allow?

Answer 2

Allow finger movement

Permits power grip

Allows fingers to be

Flexed

Extended

Abducted

Adducted

Circumducted with 1st finger which is more flexible than others

Question 3

What’s the advantage of wrist joint being present between distal end of radius and 3 proximal carpel bones?

Answer 3

Allows supination and pronation of lower part of upper limb

Allows wrist to be

Flexed

Extended

Abducted

Adducted

Question 4

Where is the wrist joint located

Answer 4

Between the distal end of radius and 3 proximal carpel bones

Question 5

Functions of incomplete ball and socket joint in glenoid cavity of scapula

Answer 5

Permits wide movement range

Helps in -

Flexion

Extension

Adduction

Rotation

Circumduction

Question 6

What are the joints formed by radius and ulna

Answer 6

Elbow Joint: Radius and Ulna articulate w humerus

Wrist Joint: Radius and ulna articulate with carpel bones

Radio-ulna Joints: Ulna and Radius articulate with each other

Question 7

Which grip type is unique to man?

Answer 7

Precision grip

Question 8

How many articular surfaces does distal end of humorous have?

Answer 8

2

Question 9

Functions of joint at base of thumb

Answer 9

Allows more mobility to thumb than other fingers

Opposable nature of thumb ( permits thumb to move perpendicular to other fingers)

Permits precision grip

Question 10

Describe what metacarpel bones articulate with in the palm

Answer 10

Proximal ends articulate w carpel bones

Distal ends articulate w phalanges

Question 11

How does upper arm help movement over a wide range?

Answer 11

Head of humerus forms an incomplete ball and socket joint in glenoid cavity of scapula, which helps wide movement range

Question 12

Whys the thumb more mobile compared to other fingers?

Answer 12

The joint present at base of the thumb, between a specific carpel bone and 1st metacarpel bones helps

Question 13

Functions of elbow Joint?

Answer 13

Acts as a hinge point

Only permits flexion and extension of forearm

Question 14

What’s the consequence of carpel bones being arranged in 2 rows?

Answer 14

They are closely fitted together so there’s limited movement between them

Question 15

How are carpel bones arranged?

Answer 15

In 2 rows (proximal and distal)

Question 16

What are the joints connected to carpel bones?

Answer 16

Proximal row bones -> wrist joint

Distal row bones -> joints w metacarpel bones

Question 17

What’s the structure of Upper limb adapted for?

Answer 17

Grasping

Weightlifting

Movement over a wide range