Detailed Study Guide for Anatomical Muscles and Actions

PowerPoint and Image Editing

• Chapter 10 of the resource from McGraw-Hill Education discusses editable labels and leader lines on images in PowerPoint.
• To edit labels in PowerPoint:
  • Select an image within the PowerPoint.
  • Click on any of the editable labels to edit or delete them according to preference.
• Recommended to refer to the Microsoft Help feature for specific PowerPoint queries.

Colorized MRI Scan

• The chapter features a colorized MRI scan illustrating the:
  • Muscles of the lumbar region
  • Muscles of the pelvic region
  • Muscles of the upper femoral regions
• Visual aids are important in anatomical education.

Anatomical Structures and Tissue Organization

• Key anatomical components identified:
  • Tendon
  • Fascia
  • Skeletal muscle
  • Muscle fascicle
  • Individual muscle fibers
  • Various muscle orientations include:
  • Posterior
  • Lateral
  • Medial
  • Anterior
  • Adjacencies to other structures:
  • Skin
  • Subcutaneous fat
  • Veins
  • Arteries
  • Nerves
  • Femur

Muscle Connective Tissue Layers

• Structural layers of muscle tissue:
  • Epimysium: surrounds entire muscle.
  • Perimysium: surrounds muscle fascicles.
  • Endomysium: surrounds individual muscle fibers.
  • Cross-sections of muscle fibers indicate:
  • Muscle fiber, cross-section (c.s.)
  • Fascicle, cross-section (c.s.)
  • Muscle fibers longitudinal section (l.s.)
  • Fascicles in longitudinal section (l.s.)

Muscle Fiber Types

• Various muscle shapes classified as:
  • Fusiform
  • Parallel
  • Triangular
  • Unipennate
  • Bipennate
  • Multipennate
  • Circular
• Specific muscle examples include:
  • Biceps brachii: fusiform muscle.
  • Rectus abdominis: parallel muscle.
  • Pectoralis major: triangular muscle.
  • Palmar interosseous: unipennate muscle.
  • Rectus femoris: bipennate muscle.
  • Deltoid: multipennate muscle.
  • Orbicularis oculi: circular muscle.

Isolated Muscle Compartments

• Each muscle group categorized by compartment:
  • Anterior compartment
  • Lateral compartment
  • Posterior compartment, both deep and superficial layers.
• Detailed illustrations demonstrate compartments such as:
  • Tibia
  • Fibula
  • Interosseous membrane
  • Nerve pathways (artery, veins)
  • Intermuscular septa
  • Fasciae
  • Subcutaneous fat

Muscles of the Arm

• Illustrated muscles include:
  • Flexors and extensors:
  • Biceps brachii
  • Brachialis
  • Triceps brachii (long and lateral heads)
• Specific attachment locations for:
  • Humerus
  • radius
  • ulna
  • tendons
  • scapula and ligaments.

Facial Muscles

• Detailed muscular anatomy regarding expression:
• Key facial muscles and their actions:
  • Occipitofrontalis: elevates eyebrows.
  • Orbicularis oculi: sphincter of eyelids.
  • Zygomaticus major/minor: facilitates smiling.
  • Orbicularis oris: encircles mouth for lip movements.
  • Platysma: draws lower lip down and outward.
  • Mentalis: protrudes lower lip.

Muscles of Chewing and Swallowing

• Muscle groups that facilitate chewing (mastication):
  • Extrinsic tongue muscles handle movement, as:
  • Genioglossus
  • Hyoglossus
  • Styloglossus
  • Palatoglossus
• Key chewing muscles:
  • Temporalis
  • Masseter
  • Medial and lateral pterygoids.

Muscles Acting on the Head and Neck

• Actions include:
  • Sternocleidomastoid: neck rotation and flexion.
  • Scalenes: assist in deep breathing.
  • Trapezius: scapular movement and neck support.

Muscles of Respiration

• Key respiratory muscles:
  • Diaphragm: primary movement in inspiration.
  • External intercostals: elevate ribs to expand thoracic cavity.
  • Internal intercostals: assist in forceful expiration.

Muscles of the Abdomen

• Description of abdominal wall muscles includes:
  • External oblique
  • Internal oblique
  • Transverse abdominal
  • Rectus abdominis
• Functions include:
  • Supporting abdominal viscera
  • Assisting in breathing and stabilization of the trunk.

Muscles of the Back

• Key muscles acting on spine:
  • Erector spinae (extensors)
  • Semispinalis muscles
  • Multifidus: stabilization of vertebral column.

Muscles Acting on the Hip and Thigh

• Major actions:
  • Iliopsoas: hip flexion.
  • Gluteal muscle groups enable leg movement and stabilization.

Muscles Acting on the Knee

• Muscles for knee flexion and extension:
  • Hamstring group (biceps femoris, semitendinosus, semimembranosus).
  • Quadriceps group (rectus femoris, vastus lateralis, vastus medialis, vastus intermedius).

Muscles Acting on the Foot and Ankle

• Primary dorsiflexors and plantarflexors include:
  • Gastrocnemius
  • Soleus
  • Flexor muscles aiding in toe movement.
• Importance of stabilizing arches during walking and running.