Skeletal and Muscular System

The fifth thoracic vertebra lies at the sternal angle. 

First rib is the shortest of all the ribs.

Ethamoid bone separates nasal cavity from the brain. It is located at the roof of nose, between the two orbits.

The correct ratio is 2 : 2 : 1 : 1. There are two inferior nasal conchas, 2 lacrimal bones, 1 mandible and 1 vomer.

The unmineralised, organic portion of the bone matrix that forms prior to the maturation of bone tissue is called an osteoid. It makes up about fifty percent of bone volume and forty percent of bone weight.

Inferior articular processes have their facets directed forward, a little medialward and downward. They are coated with hyaline cartilage.

Suprahumeral joint plays an important role in complex movements while the arm is fully flexed at the glenohumeral joint, such as changing a light bulb or painting a ceiling.

The conus medullaris is the tapered, lower end of the spinal cord. It is present near vertebral levels L1 and L2 or even lower.

Bones are made up of 39.8% calcium by mass.

Chondrocranium is the cartilaginous part of skull which is present in the embryonic stage.

In Klippel–Feil syndrome, fusion of any two of the seven cervical vertebrae occurs.

The upper part of the sternum, which is narrow in shape, is called manubrium.

Heart is an organ and is not a part of skeleton system.

The pelvic bone protects the lower abdominal organs such as urinary bladder, rectum and uterus.

The backbone or vertebral column is composed of 33 small rings like vertebrae joined end to end.