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    Related Topics

    From Musculoskeletal System

    Deltoid
    Shoulder muscle responsible for arm abduction.
    Symphyses
    Cartilaginous joints where bones are connected by fibrocartilage.
    Abductor Digiti Minimi Muscle
    The abductor digiti minimi muscle is a hypothenar muscle that abducts and flexes the little finger, aiding grip and precision in hand movements.
    Trapezius
    Muscle responsible for moving, rotating, and stabilizing the scapula.
    Flexor Tendons
    Tendons that help flex the fingers and toes.
    Rectus Abdominis
    Abs muscle that flexes the trunk.
    Sacroiliac Ligaments
    Ligaments connecting the sacrum to the iliac bones.
    Radius
    Forearm bone on the thumb side.
    Ribs (12 Pairs)
    12 pairs of bones that form the sides of the thoracic cage.
    Obliques (External and Internal)
    Muscles responsible for torso rotation.
    Lateral Collateral Ligament (LCL)
    Knee ligament that stabilizes the outer knee.
    Quadriceps
    Rectus Femoris, Vastus Medialis, Vastus Lateralis, Vastus Intermedius.
    Cervical Vertebrae (C1 - C7)
    Vertebrae in the neck region (C1-C7).
    Phalanges (14 bones)
    14 bones forming the toes.
    Metatarsals (5 bones)
    5 bones forming the mid-foot.
    Flexor and Extensor Groups
    Muscles responsible for flexing and extending the hand and wrist.
    Coracoacromial Ligament
    Ligament that connects the acromion to the coracoid process.
    Humerus
    Upper arm bone connecting the shoulder to the elbow.
    Sesamoid Bones
    e.g., patella, some found in hands/feet.
    Sternocleidomastoid
    Muscle that rotates and flexes the neck.
    Coccygeus
    Pelvic floor muscle supporting the coccyx.
    Clavicle
    Collarbone connecting the arm to the body.
    Sutures (in the skull)
    Fibrous joints between skull bones.
    Cranial Bones
    Bones of the skull that protect the brain.
    Gluteus Maximus
    Largest muscle in the buttocks responsible for hip extension.

    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? The human body has over 600 muscles.