Bones of the trunk L2

Bones of the Trunk & Throat

Part 2 of the axial skeleton

Bones of the Trunk and Throat

• Vertebral Column (Spine)
• Laryngeal Skeleton (Hyoid bone)
• Thoracic Cage (Ribs and Sternum)

Vertebral Column (Spine)

The vertebral column is a flexible column formed by a series of 33 irregular bones.There are 24 movable vertebrae, plus the sacrum and coccyx which are fused areas of bone. Commonly referred to as the spine, the vertebral column extends from the base of the skull to the pelvis. The spinal cord passes from the base of the skull through the vertebral canal within the vertebral column.

Vertebral Column (Spine)

Divided into 5 areas7 Cervical – Smallest Vertebrae, contains Atlas & Axis. (C1-C7) 12 Thoracic – Connect with the Ribs. (T1-T12) 5 Lumbar – Largest & strongest Vertebrae (L1-L5) 5 Sacral – Fuse together after birth, sit between the hips. 4 Coccygeal – Fuse together after birth (tail bone)

Laryngeal Skeleton (Hyoid)

The laryngeal skeleton, also known as the larynx or voice box, is composed of nine cartilages. It is located between the trachea and the root of the tongue.

• Only 1 bone – Hyoid Bone
• Lies at base of tongue
• Does not directly connect to any other bone
• Connected by ligaments to Temporal Bone of the Skull.

Thoracic Cage (Ribs and Sternum)

Ribs

• Long flat arched bones connected to Sternum & Vertebral column.
• 12 pairs.
• 7 True attached directly to the Sternum.
• 3 False attached to last True Rib
• 2 Floating do not attach to Sternum

The Sternum

• Long flat bone running down the front of Thorax or Thoracic cage
• Supports the Clavical.
• Attaches directly to the True ribs

Revision Task

• Learn the 5 areas and names for the vertebral column

• Learn the 3 types of rib and their locations

• Finish the WB Osteology Bones Assignment