{
  "concepts": {
    "spinal_cord.anatomy": {
      "label": "Spinal Cord Anatomy",
      "topic": "spinal_cord",
      "prerequisites": []
    },
    "spinal_cord.anterior_rami": {
      "label": "Anterior Rami of Spinal Nerves",
      "topic": "spinal_cord",
      "prerequisites": [
        "spinal_cord.anatomy"
      ]
    },
    "brachial_plexus.origin": {
      "label": "Brachial Plexus Origin (C5-T1)",
      "topic": "brachial_plexus",
      "prerequisites": [
        "spinal_cord.anterior_rami"
      ]
    },
    "brachial_plexus.trunks": {
      "label": "Brachial Plexus Trunks",
      "topic": "brachial_plexus",
      "prerequisites": [
        "brachial_plexus.origin"
      ]
    },
    "brachial_plexus.divisions": {
      "label": "Anterior and Posterior Divisions",
      "topic": "brachial_plexus",
      "prerequisites": [
        "brachial_plexus.trunks"
      ]
    },
    "brachial_plexus.cords": {
      "label": "Lateral, Medial, Posterior Cords",
      "topic": "brachial_plexus",
      "prerequisites": [
        "brachial_plexus.divisions"
      ]
    },
    "brachial_plexus.terminal_branches": {
      "label": "Terminal Branches (5 major nerves)",
      "topic": "brachial_plexus",
      "prerequisites": [
        "brachial_plexus.cords"
      ]
    },
    "peripheral_nerves.axillary": {
      "label": "Axillary Nerve (C5-C6)",
      "topic": "peripheral_nerves",
      "prerequisites": [
        "brachial_plexus.cords"
      ]
    },
    "peripheral_nerves.radial": {
      "label": "Radial Nerve (C5-T1)",
      "topic": "peripheral_nerves",
      "prerequisites": [
        "brachial_plexus.cords"
      ]
    },
    "peripheral_nerves.median": {
      "label": "Median Nerve (C5-T1)",
      "topic": "peripheral_nerves",
      "prerequisites": [
        "brachial_plexus.cords"
      ]
    },
    "peripheral_nerves.ulnar": {
      "label": "Ulnar Nerve (C8-T1)",
      "topic": "peripheral_nerves",
      "prerequisites": [
        "brachial_plexus.cords"
      ]
    },
    "rotator_cuff.muscles": {
      "label": "Rotator Cuff (SITS muscles)",
      "topic": "rotator_cuff",
      "prerequisites": [
        "peripheral_nerves.axillary",
        "peripheral_nerves.radial"
      ]
    },
    "rotator_cuff.supraspinatus": {
      "label": "Supraspinatus \u2014 Abduction initiation",
      "topic": "rotator_cuff",
      "prerequisites": [
        "rotator_cuff.muscles"
      ]
    },
    "rotator_cuff.infraspinatus": {
      "label": "Infraspinatus \u2014 External rotation",
      "topic": "rotator_cuff",
      "prerequisites": [
        "rotator_cuff.muscles"
      ]
    },
    "rotator_cuff.teres_minor": {
      "label": "Teres Minor \u2014 External rotation",
      "topic": "rotator_cuff",
      "prerequisites": [
        "rotator_cuff.muscles"
      ]
    },
    "rotator_cuff.subscapularis": {
      "label": "Subscapularis \u2014 Internal rotation",
      "topic": "rotator_cuff",
      "prerequisites": [
        "rotator_cuff.muscles"
      ]
    },
    "shoulder_joint.glenohumeral": {
      "label": "Glenohumeral Joint",
      "prerequisites": [
        "spinal_cord.anterior_rami",
        "peripheral_nerves.axillary"
      ]
    },
    "shoulder_joint.stabilizers": {
      "label": "Shoulder Stabilizers",
      "prerequisites": [
        "spinal_cord.anterior_rami",
        "rotator_cuff.muscles"
      ]
    },
    "shoulder_joint.ac_joint": {
      "label": "Acromioclavicular Joint",
      "prerequisites": [
        "spinal_cord.anterior_rami"
      ]
    },
    "elbow_joint.anatomy": {
      "label": "Elbow Joint Anatomy",
      "prerequisites": [
        "spinal_cord.anterior_rami"
      ]
    },
    "elbow_joint.ligaments": {
      "label": "Elbow Ligaments",
      "prerequisites": [
        "spinal_cord.anterior_rami",
        "peripheral_nerves.radial",
        "peripheral_nerves.ulnar"
      ]
    },
    "elbow_joint.cubital_tunnel": {
      "label": "Cubital Tunnel",
      "prerequisites": [
        "spinal_cord.anterior_rami",
        "peripheral_nerves.ulnar"
      ]
    },
    "wrist_hand.carpals": {
      "label": "Carpal Bones",
      "prerequisites": [
        "spinal_cord.anterior_rami"
      ]
    },
    "wrist_hand.intrinsic_muscles": {
      "label": "Intrinsic Hand Muscles",
      "prerequisites": [
        "spinal_cord.anterior_rami",
        "peripheral_nerves.median",
        "peripheral_nerves.ulnar"
      ]
    },
    "wrist_hand.flexor_tendons": {
      "label": "Flexor Tendons and Extensor Compartments",
      "prerequisites": [
        "spinal_cord.anterior_rami",
        "peripheral_nerves.median",
        "peripheral_nerves.radial",
        "peripheral_nerves.ulnar"
      ]
    },
    "dermatomes.upper_limb": {
      "label": "Upper Limb Dermatomes",
      "prerequisites": [
        "spinal_cord.anatomy"
      ]
    },
    "dermatomes.clinical": {
      "label": "Clinical Application of Dermatomes",
      "prerequisites": [
        "dermatomes.upper_limb",
        "spinal_cord.anatomy"
      ]
    },
    "nerve_injuries.radial": {
      "label": "Radial Nerve Injuries",
      "prerequisites": [
        "peripheral_nerves.radial",
        "upper_limb_muscles.elbow_extensors"
      ]
    },
    "nerve_injuries.ulnar": {
      "label": "Ulnar Nerve Injuries",
      "prerequisites": [
        "peripheral_nerves.ulnar",
        "wrist_hand.intrinsic_muscles"
      ]
    },
    "nerve_injuries.median": {
      "label": "Median Nerve Injuries",
      "prerequisites": [
        "peripheral_nerves.median",
        "wrist_hand.intrinsic_muscles"
      ]
    },
    "nerve_injuries.brachial_plexus": {
      "label": "Brachial Plexus Injuries",
      "prerequisites": [
        "brachial_plexus.terminal_branches"
      ]
    },
    "upper_limb_muscles.shoulder": {
      "label": "Shoulder Muscles",
      "prerequisites": [
        "spinal_cord.anterior_rami",
        "peripheral_nerves.axillary"
      ]
    },
    "upper_limb_muscles.elbow_flexors": {
      "label": "Elbow Flexor Muscles",
      "prerequisites": [
        "spinal_cord.anterior_rami",
        "peripheral_nerves.radial",
        "peripheral_nerves.radial"
      ]
    },
    "upper_limb_muscles.elbow_extensors": {
      "label": "Elbow Extensor Muscles",
      "prerequisites": [
        "spinal_cord.anterior_rami",
        "peripheral_nerves.radial"
      ]
    }
  }
}