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    Related Topics

    From Musculoskeletal System

    Ellipsoidal (Condyloid) Joints
    e.g., wrist
    Rotator Cuff Tendons
    Tendons of the rotator cuff muscles.
    Glenohumeral Ligaments
    Shoulder ligaments that stabilize the shoulder joint.
    Wormian Bones
    Sutural bones in the skull.
    Pelvic Floor Muscles
    Muscles that support pelvic organs.
    Humerus
    Upper arm bone connecting the shoulder to the elbow.
    Adductors
    Muscles that bring the thighs toward the midline.
    Patellar Tendon
    Tendon connecting the patella to the tibia.
    Symphyses
    Cartilaginous joints where bones are connected by fibrocartilage.
    Triceps Brachii
    Muscle responsible for elbow extension.
    Zygomaticus
    Muscle that raises the corners of the mouth.
    Lateral Collateral Ligament (LCL)
    Knee ligament that stabilizes the outer knee.
    Iliolumbar Ligament
    Ligament connecting the ilium and lumbar vertebrae.
    Sternum
    Breastbone located in the center of the chest.
    Vertebral Column
    Spinal column consisting of vertebrae.
    Gomphoses
    Fibrous joints where a peg fits into a socket (e.g., teeth in jaw).
    Ligamentum Flavum
    Spinal ligament connecting the laminae of adjacent vertebrae.
    Ilium
    Uppermost and largest part of the hip bone.
    Sartorius
    Longest muscle in the body responsible for hip flexion.
    Radius
    Forearm bone on the thumb side.
    Quadriceps
    Rectus Femoris, Vastus Medialis, Vastus Lateralis, Vastus Intermedius.
    Ulna
    Forearm bone on the pinky side.
    Maxillae
    Upper jaw bones that house the teeth and form part of the orbit.
    Anterior Longitudinal Ligament
    Spinal ligament running along the front of the vertebral column.
    Ischium
    Part of the pelvis that supports weight while sitting.

    Thoracic Vertebrae (T1 - T12)

    Reviewed by our medical team

    Vertebrae in the upper and mid-back (T1-T12).

    1. Overview

    The thoracic vertebrae (T1–T12) are twelve vertebrae located in the middle segment of the vertebral column. They form the backbone of the thoracic region and are uniquely structured to articulate with the ribs. The thoracic spine provides structural support, protects the spinal cord, and plays a central role in the movement and stability of the trunk.

    2. Location

    The thoracic vertebrae are positioned between the cervical and lumbar vertebrae:

    • Superiorly: Articulate with the last cervical vertebra (C7).

    • Inferiorly: Articulate with the first lumbar vertebra (L1).

    • Laterally: Articulate with the twelve pairs of ribs, forming the posterior part of the thoracic cage.

    They extend from the base of the neck (T1) to just above the abdomen (T12).

    3. Structure

    Each thoracic vertebra has unique structural features that distinguish it from cervical and lumbar vertebrae:

    • Vertebral body: Heart-shaped and larger than cervical vertebrae, increasing in size from T1 to T12.

    • Vertebral foramen: Circular and smaller than in the cervical region.

    • Spinous process: Long, slender, and angled downward (especially in the mid-thoracic region).

    • Transverse processes: Project laterally and contain costal facets for rib articulation (except T11 and T12).

    • Superior and inferior articular processes: Oriented in the coronal plane, allowing rotation but limiting flexion and extension.

    • Costal facets: Small depressions on the vertebral body and transverse processes for articulating with ribs.

    4. Function

    The thoracic vertebrae contribute to essential spinal and thoracic functions:

    • Protect the spinal cord: Form the vertebral canal through which the spinal cord passes.

    • Support the thoracic cage: Anchor the ribs and maintain the shape of the rib cage.

    • Enable trunk rotation: The coronal orientation of the facet joints allows rotational movement of the spine.

    • Load distribution: Transmit axial loads from the upper body to the lower spine.

    5. Physiological role(s)

    In addition to structural roles, thoracic vertebrae participate in physiological functions:

    • Breathing mechanics: Serve as the posterior attachment for ribs, assisting in respiratory movements.

    • Muscle attachment: Provide sites for numerous muscles involved in posture, respiration, and trunk movement.

    • Neural communication: Spinal nerves exiting the thoracic vertebrae innervate the thoracic wall, abdominal wall, and part of the upper limb.

    6. Clinical Significance

    The thoracic vertebrae are associated with various medical conditions:

    • Compression fractures:

      • Common in osteoporosis, especially in postmenopausal women and the elderly; lead to kyphotic deformity and pain.

    • Scoliosis:

      • Lateral curvature of the spine often involves the thoracic vertebrae, affecting posture and lung function.

    • Kyphosis:

      • Excessive forward curvature of the thoracic spine, may be congenital, postural, or due to vertebral compression.

    • Herniated thoracic discs:

      • Less common than in cervical/lumbar regions but can compress the spinal cord, leading to myelopathy or radiculopathy.

    • Traumatic injury:

      • High-energy trauma (e.g., motor vehicle accidents) can lead to fracture-dislocations requiring surgical stabilization.

    • Spinal metastases:

      • Thoracic vertebrae are common sites for metastatic cancer spread (e.g., breast, prostate, lung), potentially compressing the spinal cord.

    Did you know? Your feet contain 26 bones.