Skeletal and Muscular Systems Review

Coconote Al Notes

Anatomical and Biological Concepts

Epimysium

  • Definition: A layer of connective tissue that surrounds individual muscles.

Sarcomere

  • Definition: The basic contractile unit of muscle fiber, located between Z-discs.

  • Function: It is responsible for muscle contraction.

Blood Supply to Muscles

  • Blood supply to muscles increases significantly with exercise, potentially accounting for up to 75% of the cardiac output during physical activities.

Lymphatic System Landmarks

Overview

  • Essential for the immune response, the lymphatic system helps to defend against pathogens.

Functions of the Lymphoid System

  • Fluid Balance: Regulates bodily fluids to maintain homeostasis.

  • Filtration: Filters lymph fluid to remove waste and pathogens.

  • Immunity: Plays a crucial role in the body’s defense mechanism.

Lymphoid Nodules

  • Definition: Small, localized aggregations of lymphatic tissue.

Major Organs of the Lymphatic System

  1. Thymus

    • Function: Site for T cell maturation.

    • Location: Mediastinum (area in the chest between the lungs).

  2. Spleen

    • Function: Filters blood, removing old or damaged red blood cells.

    • Location: Upper left abdomen.

  3. Tonsils

    • Function: Trap pathogens entering through the throat.

Lymphocyte Types

  1. B Lymphocytes

    • Function: Responsible for humoral immunity (the immune response involving antibodies).

  2. T Lymphocytes

    • Function: Responsible for cellular immune responses, attacking infected or cancerous cells.

  3. Antigen-Presenting Cells

    • Role: Activate T lymphocytes by presenting antigens.

  4. Plasma Cells

    • Derived from B lymphocytes and produce antibodies crucial for the humoral immune response.

Major Lymphatic Vessels

  1. Thoracic Duct

    • Function: Drains lymph and empties into the left subclavian vein.

  2. Right Lymphatic Duct

    • Function: Drains lymph and empties into the right subclavian vein.

Key Terms & Definitions

  • Axial Skeleton: The skeletal component comprising bones aligned along the body's central axis.

  • Appendicular Skeleton: Bones associated with the limbs and girdles.

  • Synovial Joint: A type of joint that is characterized by a fluid-filled joint cavity allowing for free movement.

  • Suture: A type of immovable joint that is found between the bones of the skull.

  • Kinesiology: The study of movement.

Skeletal System Landmarks

Important Bone Landmarks

  • Notable landmarks include the skull, vertebrae, ribs, and pelvis.

Axial Skeleton Breakdown

  • The axial skeleton is made up of:

    • Skull

    • Vertebral column (spine)

    • Thoracic cage (ribs and sternum)

Appendicular Skeleton Breakdown

  • Comprises the limbs and girdles, which include:

    • Shoulder girdle

    • Pelvic girdle

Types of Bones

  1. Short Bones: Such as those in the wrist and ankle.

  2. Long Bones: Such as the femur and humerus.

  3. Irregular Bones: Such as vertebrae.

Bones of the Ear

  • Middle and inner ear contain the malleus, incus, and stapes.

Total Bone Count in Adults

  • An adult human has 206 bones and 12 pairs of ribs.

Articulations

  • Joints include skull joints (sutures) and the vertebral column (intervertebral discs).

Muscular System Landmarks

Muscle Types

  1. Skeletal Muscle: Striated and voluntary muscle.

  2. Cardiac Muscle: Striated and involuntary muscle found in the heart.

  3. Smooth Muscle: Non-striated and involuntary muscle found in various organs.

Major Muscle Functions

  • Intrinsic Muscles of the Hand: Control fine finger movements.

  • Abdominal Muscles: Include external/internal obliques, transverse abdominis, and rectus abdominis.

  • Diaphragm: Muscle crucial for breathing.

  • Biceps: Responsible for elbow flexion.

  • Triceps: Responsible for elbow extension.

  • **Muscles for Specific Movements: **

    • Supination: Biceps brachii.

    • Elbow extension: Triceps.

    • Crossing legs: Sartorius.

Important Facial Muscles

  • Digastric: Major opening muscle of the mouth.

  • Orbicularis Oris: Involved in kissing and blowing.

  • Zygomaticus: Associated with smiling.

  • Suprahyoid Group: Important for swallowing.

Muscle Connective Tissue Layers

  1. Endomysium: Surrounds individual muscle fibers.

  2. Perimysium: Surrounds groups of muscle fibers (fascicles).

  3. Epimysium: Surrounds the entire muscle.

Study Recommendations

  • Review specified PowerPoint slides for landmark identification.

  • Study characteristics of bone types, joint classifications, and muscle arrangements.

  • Practice naming and locating skeletal structures: skull, facial, and hand muscles.

  • Learn functions and anatomies of lymphatic organs, along with their cell types.

Additional Terminology

  • Arthrology: The study of joints.

  • Osteology: The study of bones.

  • Myology: The study of muscles.

  • Biomechanics: The science that examines the mechanics of movement.