Skeletal system - arm bones, Biology

ARM BONES -

Each arm contain 30 bones as : humerus in upper arm, radius ulna in forearm, 8 carples in wrist, 5 metacorples in plam, 14 phalnges in fingers.

HUMERUS -

Bone of upper arm. Head of humerus is fitted in glenoid cavity of scapula.

Ball and socket joint is formed.

Head bears a pair of small tuberosities, separated by intertubercular groove.

Trochlea is fitted in sigmoid notch of radius ulna.

A deltoid ridge is present at the anterior surface of humerus.

Above the trochlea supra trochlear foraman is present through which brachial artery passes out. Present in rabbit, but absent in man.

184_humerus.png               369_humerus rabbit.png

RADIUS ULNA -

Bone of fore arm. Ulna is longer than radius.

Radius is situated at thumb side. Olecranon process & sigmoid notch present at proximal end.

363_radius ulna.png                 2238_rabbit radius ulna.png

Note :- In frog radius & ulna both are fused in complete length, so the world radioulna is used instead of radius ulna.

HAND -

In hand wrist, palm & fingers are clear. In wrist carpals bones are present.

In palm metacarpals are present. In fingers phalanges are present.

The digital formula of rabbit and man is 2 3 3 3 3 = 14.

659_hand.png               2245_rabbit hand.png

                                         MAN                                                                                      RABBIT

Posted Date: 10/2/2012 9:15:29 AM | Location : United States







Related Discussions:- Skeletal system - arm bones, Assignment Help, Ask Question on Skeletal system - arm bones, Get Answer, Expert's Help, Skeletal system - arm bones Discussions

Write discussion on Skeletal system - arm bones
Your posts are moderated
Related Questions
Define Adsorption chromatography - Basic Separation Technique? Adsorption is surface interaction and is by number of forces, between surface atoms of solids and molecules of ex

What is tree girdling? What happens to a plant when that girdle is removed from the stem (below the branches)? Malpighi's girdling, or tree girdling, is the removal from a ste

Q. Classification and Justification of hemichordata? Kingdom Animalia Animals; multicellular organisms with cells that lack a cell wall, many capable of inovement or movement o

ROL E OF WATER - In general water constitutes 60-90% of protoplasm. Average 80%. It forms 2/3 of human body weight, i.e. 66.66%. Due to electrophillic nature of O, wa

Q. Managing diarrhoea in children? Managing diarrhoea in children is of great concern. The guidelines for the same are as follows: 1. The first objective is to rehydrate the

Role of Nerves - Regeneration It has been seen that soon after amputation nerves invade the regeneration blastema. If the stump is denervated by cutting the nerves supplying

Explain saturated fatty acids Some of the more significant saturated fatty acids with their systematic and common names are listed in table, and some of the unsaturated fatty a

Floral Apex Each plant must pass through a minimal 'ripeness to flower' stage. That is, even to perceive and respond to a specific photoperiodic regime, a plant must be ready

Oxidation-reduction  Potential (ORP) ORP is related to the concentration of oxidizers or reducers in a solution, and their activity or strength. It provides an indication of th

what are different forms of asexual reproduction?