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    Related Topics

    From Musculoskeletal System

    Synchondroses
    Cartilaginous joints where bones are connected by hyaline cartilage.
    Tibialis Anterior
    Muscle that dorsiflexes and inverts the foot.
    Quadriceps
    Rectus Femoris, Vastus Medialis, Vastus Lateralis, Vastus Intermedius.
    Obliques (External and Internal)
    Muscles responsible for torso rotation.
    Rotator Cuff Muscles
    Supraspinatus, Infraspinatus, Teres Minor, Subscapularis.
    Gastrocnemius
    Calf muscle responsible for plantarflexion of the foot.
    Ethmoid Bone
    Bone forming part of the nasal cavity and the orbit.
    Ribs (12 Pairs)
    12 pairs of bones that form the sides of the thoracic cage.
    Fibula
    Smaller bone in the lower leg, located alongside the tibia.
    Temporalis
    Muscle involved in closing the jaw.
    Pelvic Floor Muscles
    Muscles that support pelvic organs.
    Gliding (Plane) Joints
    e.g., between carpals
    Biceps Brachii
    Muscle responsible for elbow flexion.
    Coracoacromial Ligament
    Ligament that connects the acromion to the coracoid process.
    Buccinator
    Muscle that helps with chewing and blowing air out.
    Deltoid
    Shoulder muscle responsible for arm abduction.
    Carpals (8 bones)
    8 wrist bones.
    Cervical Vertebrae (C1 - C7)
    Vertebrae in the neck region (C1-C7).
    Occipital Bone
    Bone forming the back and base of the skull.
    Posterior Longitudinal Ligament
    Spinal ligament running along the back of the vertebral column.
    Masseter
    Muscle that elevates the mandible.
    Sesamoid Bones
    e.g., patella, some found in hands/feet.
    Lacrimal Bones
    Bones forming part of the eye socket and housing the tear ducts.
    Palatine Bones
    Bones forming part of the hard palate and nasal cavity.
    Iliolumbar Ligament
    Ligament connecting the ilium and lumbar vertebrae.

    Metatarsals (5 bones)

    Reviewed by our medical team

    5 bones forming the mid-foot.

    1. Overview

    The metatarsals are five long bones located in the foot, forming the anterior portion of the arch and connecting the tarsal bones of the midfoot to the phalanges of the toes. They play a vital role in weight-bearing, balance, and locomotion. Numbered I to V (from medial to lateral), the metatarsals are key structural elements that enable upright posture and dynamic foot movement.

    2. Location

    The metatarsals are located in the forefoot, between the tarsal bones and the phalanges:

    • Proximally: Articulate with the tarsal bones (cuneiforms and cuboid) at the tarsometatarsal (TMT) joints.

    • Distally: Articulate with the proximal phalanges at the metatarsophalangeal (MTP) joints.

    • Medially to laterally: Span from the big toe (1st metatarsal) to the little toe (5th metatarsal).

    3. Structure

    Each metatarsal is a miniature long bone made up of three main parts:

    • Base: The proximal end; articulates with tarsal bones.

    • Shaft (body): Long central portion with a slight arch contributing to the foot's longitudinal arch.

    • Head: The distal end; articulates with the proximal phalanx of each toe.

    Distinct features:

    • 1st Metatarsal: Shortest and thickest; bears the most weight and has medial and lateral sesamoid bones at its head.

    • 2nd Metatarsal: Longest and most recessed into the cuneiforms; most commonly fractured due to stress.

    • 5th Metatarsal: Has a prominent tuberosity at its base for peroneus brevis tendon insertion (common site of avulsion fractures).

    4. Function

    The metatarsals serve several mechanical and structural functions:

    • Support body weight: Form the anterior arch and distribute weight across the forefoot during standing and movement.

    • Enable locomotion: Serve as levers during toe-off in the gait cycle.

    • Maintain foot shape: Contribute to both longitudinal and transverse arches of the foot.

    • Connect tarsus and phalanges: Provide articulating surfaces for controlled toe movements.

    5. Physiological role(s)

    Metatarsals play essential roles beyond skeletal support:

    • Shock absorption: Work with muscles and soft tissues to dampen impact forces during running or jumping.

    • Fine motor balance: Allow for subtle adjustments in posture and balance during complex foot positioning.

    • Muscle and ligament attachment: Serve as anchor points for intrinsic and extrinsic foot muscles, supporting foot motion and stabilization.

    • Dynamic adaptation: Enable the foot to adapt to different surfaces through micro-movements across the metatarsal heads.

    6. Clinical Significance

    The metatarsals are commonly involved in various orthopedic, sports-related, and structural foot conditions:

    • Metatarsal fractures:

      • Stress fractures: Often occur in athletes due to repetitive loading, especially in the 2nd and 3rd metatarsals.

      • Avulsion fractures: Common at the base of the 5th metatarsal (e.g., "Jones fracture").

    • Metatarsalgia:

      • Pain and inflammation in the ball of the foot, often due to overuse or improper footwear.

    • Bunion (hallux valgus):

      • Lateral deviation of the 1st metatarsal leads to joint misalignment and bony prominence.

    • Morton’s neuroma:

      • Nerve compression between metatarsal heads, commonly between the 3rd and 4th toes, causing burning or tingling sensations.

    • Flatfoot or high arches:

      • Abnormalities in the metatarsal arch can contribute to altered gait and pain syndromes.

    • Diabetic foot complications:

      • Metatarsal heads are frequent pressure points prone to ulceration in neuropathic patients.

    Did you know? Your hand has 5 metacarpal bones.