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
During mitosis ER and nucleolus begin to disappear at: 1.  Late prophase 2. Early metaphase 3. Late metaphase 4. Early prophase Late prophase

Q. What are the three stages into which the cell respiration is divided? The three stages of aerobic cell respiration are glycolysis, Krebs cycle and respiratory chain also kno

Following fertilization by a normal sperm, what chromosome condition is created?

in natural vegetative propagation which structure gives rise to new individuals?

What are the four groups of protozoans? The four major groups of protozoans are the sarcodines (that form pseudopods, like amoebae), the mastigophores (flagellated, such as the

What is Cerebrum Cerebrum is divided into right and left parts known as cerebral hemisphere. It is the largest part of the brain. The functions of the cerebrum:  It recei

Speculate on the necessity of interdependence of volvox organisms in the colonial existence

Describe Stanley miller experiment to test the idea of probiotic synthesis. What is the primordial soup?

How vitamin e is directly related to Vitamins A, D and K? A high intake of vitamin E interferes with the functions of other fat-soluble vitamins such as vitamin K absorpt

factors affecting nitrogen balance