Apparatus for inspecting a biological tissue (5, 51) comprising: - an illuminator adapted to provide an illuminating light beam to illuminate a portion of said biological tissue, said illuminating beam being shaped so that at least a portion of said illuminating beam has a line-shaped section; - one or more lenses (2, 4, 7) adapted to focus said illuminating beam on said biological tissue, during operation of said apparatus said illuminating beam illuminating a line-shaped region of biological tissue extending along a main extension direction; - a scanning assembly adapted to perform optical scans of said biological tissue by moving the illuminating beam projected by said illuminator on said biological tissue, along a scanning direction substantially perpendicular to the main extension direction of the line-shaped region of biological tissue illuminated by said illuminating beam; - acquisition means adapted to receive reflected light by said biological tissue to acquire images of said biological tissue or to allow an operator to observe said biological tissue; characterised in that said scanning assembly comprises: - a fixed support; - a first oscillating group comprising at least a first mobile arm and a mirror fixed to said first mobile arm and adapted to receive said illuminating beam, said first mobile arm being linked to said fixed support through one or more first joints allowing a rotation of said first mobile arm about a first rotation axis; - a second oscillating group comprising at least a second mobile arm, a first lens and a diaphragm comprising a slot-shaped opening, said first lens and said diaphragm being fixed to said second mobile arm and adapted to receive reflected light by said biological tissue, said second mobile arm being linked to said fixed support through one or more second joints allowing a rotation of said second mobile arm about a second rotation axis; - mechanical transmission means adapted to mutually link said first and second mobile arms, said mechanical transmission means being configured to synchronize the oscillating rotation movements of said first and second mobile arms. - an illuminator adapted to provide an illuminating light beam to illuminate a portion of said biological tissue, said illuminating beam being shaped so that at least a portion of said illuminating beam has a line-shaped section; - one or more lenses (2, 4, 7) adapted to focus said illuminating beam on said biological tissue, during operation of said apparatus said illuminating beam illuminating a line-shaped region of biological tissue extending along a main extension direction; - a scanning assembly adapted to perform optical scans of said biological tissue by moving the illuminating beam projected by said illuminator on said biological tissue, along a scanning direction substantially perpendicular to the main extension direction of the line-shaped region of biological tissue illuminated by said illuminating beam; - acquisition means adapted to receive reflected light by said biological tissue to acquire images of said biological tissue or to allow an operator to observe said biological tissue; - a fixed support; - a first oscillating group comprising at least a first mobile arm and a mirror fixed to said first mobile arm and adapted to receive said illuminating beam, said first mobile arm being linked to said fixed support through one or more first joints allowing a rotation of said first mobile arm about a first rotation axis; - a second oscillating group comprising at least a second mobile arm, a first lens and a diaphragm comprising a slot-shaped opening, said first lens and said diaphragm being fixed to said second mobile arm and adapted to receive reflected light by said biological tissue, said second mobile arm being linked to said fixed support through one or more second joints allowing a rotation of said second mobile arm about a second rotation axis; - mechanical transmission means adapted to mutually link said first and second mobile arms, said mechanical transmission means being configured to synchronize the oscillating rotation movements of said first and second mobile arms.