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

Q Beings from four phyla of the animal kingdom "breath" (do gas exchange) by diffusion. Which are those phyla? How is this type of respiration associated to features present in tho

Can two normal individuals of the same species with sexual reproduction have identical genomes and identical karyotypes? How is the human karyotype usually represented? Except

Explain Objectives of Root-End Resection Apicoectomy a) Removal of untreated apical portion of the root, b) Enable the obturator to determine the cause of failure,  c) To

What is the molecular composition of hemoglobin? Does the functionality of hemoglobin as a protein depend upon its tertiary or upon its quaternary structure? Hemoglobin is a mo

Determine the Basic Seven Food Groups - Nutritions? These basic seven food groups are: 1) Cereals and cereal products 2) Pulses (also meat and meat products) 3) Milk and m

Explain about the Dehydration or Drying? The technique of drying is the oldest method of food preservation practiced by mankind. The removal of moisture, which is actually dehy

Q. Describe Lipoprotein? Ans. There is considerable current interest in this lipoprotein, which consists of LDL with an additional apoprotein-apoprotein (a) attached to it

For homework, I had to prove that a certain catalyst was a protein, then tell how I would purify the protein, then tell how I would clone a human chromosomal region that contains t

Define Transverse section of body of male Ascaris? 1. Body wall consists of the following: (a) Cuticle is the outermost layer. It is a thick, tough, elastic membrane