筋きん肉にく内ない注ちゅう射しゃ

• 皮ひ下か注ちゅう射しゃ

  皮下注射 is a subcutaneous injection (under the skin), while 筋肉内注射 is an intramuscular injection (into the muscle).

• 静じょう脈みゃく注ちゅう射しゃ

  静脈注射 is an intravenous injection (into a vein), while 筋肉内注射 is an intramuscular injection (into the muscle).

Compound of 筋肉 (muscle) + 内 (inside) + 注射 (injection).